Bitbucket.org
Unlimited public and private repos (Git and Mercurial) for up to 5 users with Pipelines for CI/CD
About.gitlab.com
Unlimited public and private Git repos with unlimited collaborators
Visualstudio.com
Unlimited private repos (Git and TFS) for up to 5 users/team
Cloud.google.com
Free private Git repositories hosted on Google Cloud Platform. Supports syncing with existing GitHub and Bitbucket repos. Free Beta for up to 500 MB of storage
NotABug
.org is a free-software code collaboration platform for freely licensed projects, Git-based
Projectlocker.com
One free private project (Git and Subversion) with 50 MB space
Bintray.comJCenter
Frog Bintray hosts Open Source projects for free, and supports Docker, Maven, NuGet, npm, Debian, RPM, Conan, Vagrant, Opkg, yum, and also home to JCenter the most comprehensive collection of Maven artifacts.
Central.sonatype.org
The default artifact repository for Apache Maven, SBT and other build systems.
Packagecloud.io
Easy to use repository hosting for: Maven, RPM, DEB, PyPi and RubyGem packages (has free tier).
Cloudsmith.io
Simple, secure and centralised repository service for Java/Maven, RedHat, Debian, Python, Ruby, Vagrant +more. Free tier + free for open source.
Jitpack.io
Maven repository for JVM and Android projects on GitHub, free for public projects.
Scinote.net
Scientific data management and team collaboration. One Team with unlimited number of users, backup and 1 GB storage space
Gitter.im
Chat, for GitHub. Unlimited public and private rooms, free for teams up to 25
Hangouts.google.com
One place for all your conversations, for free, need a Google account
Seafile.com
Private or cloud storage, file sharing, sync, discussions. Private version is full. Cloud version has just 1 GB
Yammer.com
Private social network standalone or for MS Office 365. Free with a bit less admin tools and users management features
Helpmonks.com
Shared inbox for teams, free for Open Source and nonprofit organizations
Typetalk.in
Share and discuss ideas with your team through instant messaging on the web or on your mobile
Talky.io
Free group video chat. Anonymous. Peer‑to‑peer. No plugins, signup, or payment required
Helplightning.com
Help over video with augmented reality. Free without analytics, encryption, support
Evernote.com
Tool for organizing information. Share your notes and work together with others
Doodle.com
The scheduling tool you'll actually use. Find a date for a meeting two times faster
Sendtoinc.com
Share links, notes, files and have discussions. Free for 3 and 100 MB
Zoom.us
Secure Video and Web conferencing, add-ons available. Free limited to 40 minutes
Ideascale.com
Allow clients to submit ideas and vote, free for 25 members in 1 community
Wistia.com
Video hosting with viewer analytics, HD video delivery and marketing tools to help understand your visitors, 25 videos and Wistia branded player
Cnverg.com
Real-time shared visual workspace, whiteboard, GitHub integration. Free 5 GB, 5 spaces and 5 collaborators, no GitHub repos
Flock.com
A faster way for your team to communicate. Free Unlimited Messages, Channels, Users, Apps & Integrations
Igloo
nternal portal for sharing documents, blogs and calendars etc. Free for up to 10 users.
Riot.im
A decentralized communication tool built on Matrix. Group chats, direct messaging, encrypted file transfers, voice and video chats, and easy integration with other services.
Microsoft Teams
hat-based digital hub that brings conversations, content, and apps together in one place all from a single experience. Free for up to 300 users.
Tachikoma.io
Dependency Update for Ruby, Node.js, Perl projects, free for Open Source
Deppbot.com
Automated Dependency Updates for Ruby projects, free for Open Source
Insight.sensiolabs.com
Code Quality for PHP/Symfony projects, free for Open Source
Codacy.com
Automated code reviews for PHP, Python, Ruby, Java, JavaScript, Scala, CSS and CoffeeScript, free for Open Source
Scan.coverity.com
Static code analysis for Java, C/C++, C# and JavaScript, free for Open Source
Webceo.com
SEO tools but with also code verifications and different type of advices
Browserling.com
Live interactive cross-browser testing, free only 3 minutes sessions with MS IE 9 under Vista at 1024 x 768 resolution
Beanstalkapp.com
A complete workflow to write, review and deploy code), free account for 1 user and 1 repository with 100 MB of storage
Testanywhere.co
Automatic test website or web app continuously and catch bugs in the early stages, free 1,000 tests/month
Blamewarrior.com
Tool to automatically assign reviewers for new pull requests and track statistics of review process, free for Open Source
Reviewable.io
Code review for GitHub repositories, free for public or personal repos
Sonarcloud.io
Automated source code analysis for Java, JavaScript, C/C++, C#, VB.NET, PHP, Objective-C, Swift, Python, Groovy and even more languages, free for Open Source
Codota.com
Codota helps developers create better software, faster by providing insights learned from all the code in the world. Plugin available.
Libraries.io
Search and dependency update notifications for 32 different package managers, free for open source
Sourcegraph.com
Java, Go, Python, Node.js, etc., code search/cross-references, free for Open Source
Dev.azure.com
10 free parallel jobs with unlimited minutes for open source for Linux, macOS, and Windows
Codefresh.io
Free-for-Life plan: 1 build, 1 environment, shared servers, unlimited public repos
Codeship.com
100 private builds/month, 5 private projects, unlimited for Open Source
Shippable.com
150 private builds/month, free for 1 build container, private and public repos
Buddybuild.com
Build, deploy and gather feedback for your iOS and Android apps in one seamless, iterative system
Gitlab.com
Create pipelines directly from Git repositories using GitLab's CI service
Buddy.works
A CI/CD with 5 free projects and 1 concurrent runs (120 executions/month)
Gridlastic.com
Selenium Grid testing with free plan up to 4 simultaneous selenium nodes/10 grid starts/4,000 test minutes/month
Saucelabs.comfree for Open Source
Cross browser testing, Selenium testing and mobile testing, free for Open Source
Browserstack.com
Manual and automated browser testing, free for Open Source
Everystep-automation.com
Records and replays all steps made in a web browser and creates scripts,... free with fewer options
Applitools.com
art visual validation for web, native mobile and desktop apps. Integrates with almost all automation solutions (like Selenium and Karma) and remote runners (Sauce Labs, Browser Stack). free for open source. A free tier for a single user with limited checkpoints per week.
Checkbot.io
Browser extension that tests if your website follows 50+ SEO, speed and security best practices. Free tier for smaller websites.
Pyup.io
Monitory Python dependencies for security vulnerabilities and update them automatically. Free for one private project, unlimited projects for open source.
Threatconnect.com
Threat intelligence: It is designed for individual researchers, analysts and organizations who are starting to learn about cyber threat intelligence. Free up to 3 Users
Crypteron.com
Cloud-first, developer-friendly security platform prevents data breaches in .NET and Java applications
Snyk.io
Snyk found and reported several vulnerabilities in the package.Limited to 1 private project (unlimited for open source projects)
Letsencrypt.org
Free SSL Certificate Authority with certs trusted by all major browsers
Okta
User management, authentication and authorization. Free for up to 1000 monthly active users.
Duo.com
Two-factor authentication (2FA) for website or app. Free 10 users, all authentication methods, unlimited, integrations, hardware tokens
Tinfoilsecurity.com
Automated vulnerability scanning. Free plan allows weekly XSS scans
Foxpass.com
Hosted LDAP and RADIUS. Easy per-user logins to servers, VPNs and wireless networks. Free for 10 users
Opswat.com
Security Monitoring of computers, devices, applications, configurations,... Free 25 users and 30 days history
Bitninja.io
Botnet protection through a blacklist, free plan only reports limited information on each attack
Onelogin.com
Identity as a Service (IDaaS), Single Sign-On Identity Provider, Cloud SSO IdP, 3 company apps and 5 personal apps, unlimited users
Logintc.com
Two-factor authentication (2FA) by push notifications, free for 10 users, VPN, Websites and SSH
Cloudsploit.com
Amazon Web Services (AWS) security and compliance auditing and monitoring
Internet.nl
Test for modern Internet Standards like IPv6, DNSSEC, HTTPS, DMARC, STARTTLS and DANE
Mozilla Observatory
Find and fix security vulnerabilities in your site.
Crowdin.com
Unlimited projects, unlimited strings and collaborators for Open Source
Loco
Free up to 2000 translations, Unlimited translators, 10 languages/project, 1000 translatable assets/project
Cloudsploit.com
cloudsploit.com — AWS security and configuration monitoring. Free: unlimited on-demand scans, unlimited users, unlimited stored accounts. Subscription: automated scanning, API access, etc
Elastic.co
elastic.co — Instant performance insights for JS developers. Free with 24 hours data retention
Thousandeyes.com
thousandeyes.com — Network and user experience monitoring. 3 locations and 20 data feeds of major web services free
Statuscake.com
statuscake.com — Website monitoring, unlimited tests free with limitations
Ghostinspector.com
ghostinspector.com — Free website and web application monitoring. Single user, 100 test runs/month
Sematext.com
sematext.com — Free for 24 hours metrics, unlimited number of servers, 10 custom metrics, 500,000 custom metrics data points, unlimited dashboards, users, etc
Appdynamics.com
appdynamics.com — Free for 24 hours metrics, application performance management agents limited to one Java, one .NET, one PHP and one Node.js
Deadmanssnitch.com
deadmanssnitch.com — Monitoring for cron jobs. 1 free snitch (monitor), more if you refer others to sign up
Freeboard.io
freeboard.io — Free for public projects. Dashboards for your Internet of Things (IoT) projects
Speedchecker.xyz
speedchecker.xyz — Performance Monitoring API, checks Ping, DNS, etc
Blackfire.io
blackfire.io — Blackfire is the SaaS-delivered Application Performance Solution. Free Hacker plan (PHP only)
Apimetrics.io
apimetrics.io — Automated API Performance Monitoring, Testing and Analytics. Free Plan, manually make API calls and Run from their West Coast servers
Opsdash.com
opsdash.com — Self-hoster server, clusters and services monitoring, free for 5 servers and 5 services
Healthchecks.io
healthchecks.io — Monitor your cron jobs and background tasks. Unlimited free checks
Appbeat.io
appbeat.io — Website monitoring, 3 monitors free. They offer very reliable and affordable monitor service.
Assertible.com
assertible.com — Automated API testing and monitoring. Free plans for teams and individuals.
Letsmonitor.org
letsmonitor.org — TLS certificate expiration and connectivity monitoring with email and SMS alerts.
Rollbar.com
Exception and error monitoring, free plan with 5,000 errors/month, unlimited users, 30 days retention
Sentry.io
Sentry tracks app exceptions in real-time, has a small free plan. Free, unrestricted use if self-hosted
Algolia.com
Hosted search-as-you-type (instant). Free hacker plan up to 10,000 documents and 100,000 operations. Bigger free plans available for community/Open Source projects
Swiftype.com
Hosted search solution (API and crawler). Free for a single search engine with up to 1,000 documents. Free upgrade to premium level for Open Source
Indexisto.com
Site search, free 10 million documents index limit with advertisement block
Mailinator.com
Free, public, email system where you can use any inbox you want
Phplist.comMailerLite.com
Hosted version allow 300 emails/month free *MailerLite.com — 1,000 subscribers/month, unlimited email free
Mailtrap.io
Fake SMTP server for development, free plan with 1 inbox, 50 messages, no team member, 2 emails/second, no forward rules
Moosend.com
Mailing list management service. Free account for 6 months for startups
Mailboxlayer.com
Email validation and verification JSON API for developers. 1,000 free API requests/month
Pepipost.com
Unlimited emails free for first three months, then first 25,000 emails/month free
Mail-tester.com
Test if email's dns/spf/dkim/dmarc settings are correct, 20 free/month
Migadu.com
Email Hosting (Webmail, SMTP, IMAP, ...) — free plan is limited to 10 outgoing mails/day
Cloudflare.com
Basic service is free, good for a blog, it also offers a free SSL certificate service
Jsdelivr.com
CDN of OSS (JS, CSS, fonts) for developers and webmasters, accepts PRs to add more
Developers.google.com
The Google Hosted Libraries is a content distribution network for the most popular, Open Source JavaScript libraries
Asp.net
The Microsoft Ajax CDN hosts popular third party JavaScript libraries such as jQuery and enables you to easily add them to your Web application
Toranproxy.com
Proxy for Packagist and GitHub. Never fail CD. Free for personal use, 1 developer, no support
Rawgit.com
Free limited traffic, serves raw files directly from GitHub with proper Content-Type headers
Fastly.com
Free CDN, all features until USD 50/month is reached, enough for most, then pay or suspended
Section.io
A simple way to spin up and manage a complete Varnish Cache solution. Supposedly free forever for one site
Speeder.io
Uses KeyCDN. Automatic image optimization and free CDN boost. Free and does not require any server changes
Jare.io
You should log in using your GitHub account and register your domain. Uses AWS CloudFront
Wedeploy.com
WeDeploy gives you predefined services that can speed up your development process. Free plan: 1 GB Transfer, 1 GB Memory, 1 CPU, 512 MB Storage, 2 Service Instances, 2 Projects
Cloud.google.com
Google App Engine gives 28 instance hours/day free, 1 GB NoSQL database and more
Firebase.google.com
Build real-time apps, the free plan has 100 max connections, 10 GB data transfer, 1 GB data storage, 1 GB hosting storage and 10 GB hosting transfer
Outsystems.com
Enterprise web development PaaS for on-premise or cloud, free "personal environment" offering allows for unlimited code and up to 1 GB database
Scn.sap.com
The in-memory Platform-as-a-Service offering from SAP. Free developer accounts come with 1 GB structured, 1 GB unstructured, 1 GB of Git data and allow you to run HTML5, Java and HANA XS apps
Mendix.com
Rapid Application Development for Enterprises, unlimited number of free sandbox environments supporting 10 users, 100 MB of files and 100 MB database storage each
Pythonanywhere.com
Cloud Python app hosting. Beginner account is free, 1 Python web application at your-username.pythonanywhere.com domain, 512 MB private file storage, one MySQL database
Configure.it
Mobile app development platform, free for 2 projects, limited features but no resource limits
Zeit.co/now
Managed platform for Node.js, static sites and Docker deployments. Limited to 3 concurrent instances, 1 GB storage and 1 GB bandwidth for OSS projects (source files are exposed on a public URL)
Sandstorm.io
Sandstorm is an open source operating system for personal and private clouds. Free plan offers 200 MB storage and 5 grains free
Gearhost.com
Platform for .NET and PHP apps. 256 MB of RAM for free on a shared server with limited resources
Glitch.com
Free unlimited public/private hosting with features such as code sharing and real-time collaboration
Postgress.com
Mobile backend, starter plan has unlimited requests/second, with 1 GB of data storage. Enterprise application support
Backendless.com
Mobile and Web Baas, with 1 GB file storage free, push notifications 50000/month, and 1000 data objects in table.
Hasura.io
Platform to build and deploy app backends fast, free for single node cluster.
Pusher.com
Free, unlimited push notifications for 2000 monthly active users. A single API for iOS and Android devices.
Quickblox.com
A communication backend for instant messaging, video and voice calling and push notifications
Getstream.io
Build scalable news feeds and activity streams in a few hours instead of weeks, free for 3 million feed updates/month
Tyk.io
API management with authentication, quotas, monitoring and analytics. Free cloud offering
Iron.io
Async task processing (like AWS Lambda) with free tier and 1 month free trial
Nstack.com
Async task processing (like AWS Lambda). 10 free private services and unlimited free public services
Pubnub.com
Free push notifications for up to 1 million messages/month and 100 active daily devices
Pushtechnology.com
Real-time Messaging for browsers, smartphones and everyone. 100 concurrent connections. Free 10 GB data/month
Zapier.com
Connect the apps you use, to automate tasks. 5 zaps, every 15 minutes and 100 tasks/month
Stackstorm.com
Event-driven automation for apps, services and workflows, free without flow, access control, LDAP,...
Simperium.com
Move data everywhere instantly and automatically, multi-platform, unlimited sending and storage of structured data, max. 2,500 users/month
Pushcrew.com
Push notification service. Unlimited notifications up to 2000 Subscribers
Streamdata.io
Turns any REST API into an event-driven streaming API. Free plan up to 1 million messages and 10 concurrent connections
Posthook.io
Job Scheduling Service. Allows you to schedule requests for specific times. 500 scheduled requests/month free.
Closeheat.com
Development Environment in the Cloud for Static Websites with Free Hosting and GitHub integration. 1 free website with custom domain support
Devport.co
Turn GitHub projects, apps and websites into a personal developer portfolio
Netlify.com
Builds, deploy and hosts static site or app, free for 100 GB data and 100 GB/month bandwidth
Sanity.io
– Hosted backend for structured content with customizeable MIT licensed editor built with React. Unlimited projects. 3 users, 2 datasets, 500k API CDN requests, 5GB assets for free per project
Pantheon.io
Drupal and WordPress hosting, automated DevOps and scalable infrastructure. Free for developers and agencies
Acquia.com
Hosting for Drupal sites. Free tier for developers. Free development tools (such as Acquia Dev Desktop) also available
Readthedocs.org
Free documentation hosting with versioning, PDF generation and more
Bubble.is
Visual programming to build web and mobile apps without code, free 100 visitors/month, 2 apps
Contentful.com
Content as a Service. Content management and delivery APIs in the cloud. 3 users, 3 repositories and 100,000 API requests/month for free
Tilda.cc
One site, 50 pages, 50 MB storage, only the main pre-defined blocks among 170+ available, no fonts, no favicon and no custom domain
Surge.sh
Static web publishing for Front-End developers. Unlimited sites with custom domain support
Noip
a dynamic dns service that allows up to 3 hostnames free with confirmation every 30 days
Duckdns.org
Free DDNS with up to 5 domains on the free tier. With configuration guides for various setups.
Backblaze.com
Backblaze B2 cloud storage. Free 10 GB (Amazon S3-like) object storage for unlimited time
Redsmin.com
Online real-time monitoring and administration service for Redis, 1 Redis instance free
Graphenedb.com
Neo4j as a service, up to 1,000 nodes and 10,000 relations free
Scalingo.com
Primarily a PaaS but offers a 512 MB free tier of MySQL, PostgreSQL or MongoDB
Skyvia.com
Cloud Data Platform, offers free tier and all plans are completely free while in beta
Airtable.com
Looks like a spreadsheet, but it's a relational database, unlimited bases, 1,200 rows/base and 1,000 API requests/month
Spreadsheetdb.io
Database that can be queried with spreadsheets, 3 spreadsheets and 200 rows free
FaunaDB
is a distributed, multi-model, ACID-compliant, and globally scalable database, free tier gives 5 GB
Scaledrone.com
Push messaging service. Free for up to 20 simultaneous connections and 100,000 messages/day
Pusher.com
Realtime messaging service. Free for up to 100 simultaneous connections and 200,000 messages/day
stun:stun.l.google.com:19302 — Google STUN
stun:global.stun.twilio.com:3478?transport=udp — Twilio STUN
Segment.com
Hub to translate and route events to other third party services. 100,000 events/month free
Cloudamqp.com
RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ's
Serveo.net
Quickly expose any local port to the public internet on a servo subdomain using an SSH tunnel, includes SSH GUI to replay requests over HTTP.
ZeroTier
FOSS managed virtual Ethernet as a service. Unlimited end-to-end encrypted networks of 100 clients on free plan. Clients for desktop/mobile/NA; web interface for configuration of custom routing rules and approval of new client nodes on private networks.
Hamachi
LogMeIn Hamachi is a hosted VPN service that lets you securely extend LAN-like networks to distributed teams with free plan allows unlimited networks with up to 5 peoples
Webhookrelay.com
Manage, debug, fan-out and proxy all your webhooks to public or internal (ie: localhost) destinations. Also, expose servers running in a private networks over a tunnel by getting a public HTTP endpoint (https://yoursubdomain.webrelay.io <----> http://localhost:8080).
Kanbantool.com
Kanban board based project management. Free, paid plans with more options
Kanbanflow.com
Board based project management. Free, premium version with more options
Zenhub.io
The only project management solution inside GitHub. Free for public repos, OSS and nonprofit organizations
Clickup.com
Project management. Free, premium version with cloud storage. Mobile applications and Git integrations available
Waffle.io
Board based project management solution from your existing GitHub Issues, free for Open Source
Huboard.com
Instant project management for your GitHub issues, free for Open Source
Taiga.io
Project management platform for startups and agile developers, free for Open Source
Jetbrains.com
Free hosted YouTrack (InCloud) for FOSS projects, private projects (free for 10 users)
Github.com
In addition to its Git storage facility, GitHub offers basic issue tracking
Gliffy.com
Online diagrams: flowchart, UML, wireframe,... Also plugins for Jira and Confluence. 5 diagrams and 2 MB free
Cacoo.com
Online diagrams in real-time: flowchart, UML, network. Free max. 15 users/diagram, 25 sheets
Draw.io
Online diagrams stored locally, in Google Drive, OneDrive or Dropbox. Free for all features and storage levels
Visualstudio.com
Unlimited free private code repositories; Tracks bugs, work items, feedback and more
Testlio.com
Issue tracking, test management and beta testing platform. Free for private use
Targetprocess.commore details
Visual project management, from Kanban and Scrum to almost any operational process. Free for unlimited users, up to 1,000 data entities {more details}
Taskulu.com
Role based project management. Free up to 5 users. Integration with GitHub/Trello/Dropbox/Google Drive
Contriber.com
Customizable project management platform, free starter plan, 5 workspaces
Ubertesters.com
Test platform, integration and crowdtesters, 2 projects, 5 members
Jetbrains.com
h based on time tracking, attachments on Agile Board, and many other improvements. 10 users 5 GB free
Plan.io
Project Management with Repository Hosting and mor options. Free for 2 users with 10 customers and 500MB Storage
Zenkit.com
Project management and collaboration tool. Free for up to 5 members, 5 GB attachments.
Instabug
A comprehensive bug reporting and in-app feedback SDK for mobile apps. Free plan up to 1 app and 1 member.
Office 365 Developer
- Free one-year Office 365 E3 subscription for development/testing.
Cloudinary.com
Image upload, powerful manipulations, storage and delivery for sites and apps, with libraries for Ruby, Python, Java, PHP, Objective-C and more. Perpetual free tier includes 7,500 images/month, 2 GB storage, 5 GB bandwidth
Gumlet.com
Image resize-as-a-service. It also optimizes images and performs delivery via CDN. Free tier includes 1 GB bandwidth and unlimited number of image processing every month for 1 year.
Plot.ly
Graph and share your data. Free tier includes unlimited public files and 10 private files
Transloadit.com
Handles file uploads and encoding of video, audio, images, documents. Free for Open Source and other do-gooders. Commercial applications get 1 GB free for test driving
Podio.com
You can use Podio with a team of up to five people and try out the features of the Basic Plan, except users management
Kraken.io
Image optimization for website performance as a service, free plan up to 1 MB file size
Placekitten.com
A quick and simple service for getting pictures of kittens for use as placeholders
Embed.ly
Provides APIs for embedding media in a webpage, responsive image scaling, extracting elements from a webpage. Free for up to 5,000 URLs/month at 15 requests/second
Otixo.com
Encrypt, share, copy and move all your cloud storage files from one place. Basic plan provides unlimited files transfer with 250 MB max. file size and allows 5 encrypted files
Tinypng.com
API to compress and resize PNG and JPEG images, offers 500 compressions for free each month
Filestack.com
File picker, transform and deliver, free for 250 files, 500 transformations and 3 GB bandwidth
Packagecloud.io
Hosted Package Repositories for YUM, APT, RubyGem and PyPI. Limited free plans, open source plans available via request
Jsonbin.io
Free JSON data storage service, ideal for small-scale web apps, website, mobile apps.
Cloudconvert.com
Convert anything to anything. 208 supported formats including videos to gif
Clevebrush.com
Free Graphics Design / Photo Collage App, also they offer paid integration of it as component
Walkme.com
Enterprise Class Guidance and Engagement Platform, free plan 3 walk-thrus up to 5 steps/walk
Zeplin
Designer and developer collaboration platform. Show designs, assets and styleguides. Free for 1 project.
Figma.com
Online, collaborative design tool for teams; free tier includes unlimited files and viewers with a max of 2 editors and 3 projects
Photopea.com
- A Free, Advanced online design editor with Adobe Photoshop UI supporting PSD, XCF & Sketch formats (Adobe Photoshop, Gimp and Sketch App).
Geocoder.opencagedata.com
Geocoding API that aggregates OpenStreetMap and other open geo sources. 2,500 free queries/day
Graphhopper.com
A free package for developers is offered for Routing, Route Optimization, Distance Matrix, Geocoding, Map Matching.
Gogeo.io
Maps and geospatial services with an easy to use API and support for big data
Osmnames
Geocoding, search results ranked by the popularity of related Wikipedia page
Tilehosting
Vector maps, map services and SDKs for map visualisation. Free vector tiles with weekly update and four map styles.
Here
APIs and SDKs for maps and location-aware apps. 250k transactions/month for free.
Build.opensuse.org
Package build service for multiple distros (SUSE, EL, Fedora, Debian etc.)
Copr.fedorainfracloud.org
Mock-based RPM build service for Fedora and EL
Codeanywhere.com
Full IDE in the browser and mobile apps. Access FTP, SFTP, Dropbox, Google Drive, GitHub and BitBucket. Hosted virtual machines with terminal access. Collaboration features like share links, live editing, permissions and version tracking (free tier includes 256MB RAM, 2GB HDD, 1 remote connection, no always on machine)
Codenvy.com
IDE and automated developer workspaces in a browser, collaborative, Git/SVN integration, build and run your app in customizable Docker-based runners (free tier includes: 3 GB RAM, ability to run multiple machines simultaneously), pre-integrated deploy to Google Apps
Visualstudio.com
Fully-featured IDE with thousands of extensions, cross-platform app development (Microsoft extensions available for download for iOS and Android), desktop, web and cloud development, multi-language support (C#, C++, JavaScript, Python, PHP and more)
Cocalc.com
(formerly SageMathCloud at cloud.sagemath.com) — Collaborative calculation in the cloud. Browser access to full Ubuntu with built-in collaboration and lots of free software for mathematics, science, data science, preinstalled: Python, LaTeX, Jupyter Notebooks, SageMath, scikitlearn, etc
Wakatime.com
Quantified self-metrics about your coding activity, using text editor plugins, limited plan for free
Apiary.io
Collaborative design API with instant API mock and generated documentation (Free for unlimited API blueprints and unlimited user with one admin account and hosted documentation)
Mockable.io
Mockable is a simple configurable service to mock out RESTful API or SOAP web-services. This online service allows you to quickly define REST API or SOAP endpoints and have them return JSON or XML data
Fakejson.com
FakeJSON helps you quickly generate fake data using its API. Make an API request describing what you want and how you want it. The API returns it all in JSON. Speed up the go to market process for ideas and fake it till you make it.
JSONPlaceholder
me REST API endpoints that return some fake data in JSON format. The source code is also available if you would like to run the server locally.
Jetbrains.com
Productivity tools, IDEs and deploy tools. Free license for students, teachers, Open Source and user groups
Cacher.io
- Code snippet organizer with labels and support for 100+ programming languages
Heapanalytics.com
Automatically captures every user action in iOS or web apps. Free for up to 5,000 visits/month
Sematext.com
Free for up to 50 K actions/month, 1 day data retention, unlimited dashboards, users, etc
Usabilityhub.com
Test designs and mockups on real people, track visitors. Free for one user, unlimited tests
Keen.io
Custom Analytics for data collection, analysis and visualization. 50,000 events/month free
Hotjar.com
Per site: 2,000 pages views/day, 3 heatmaps, data stored for 3 months,...
Imprace.com
Landing page analysis with suggestions to improve bounce rates. Free 5 landing pages/domain
Optimizely.com
A/B Testing solution, free starter plan, 1 website, 1 iOS and 1 Android app
Hotjar.com
Per site: 2,000 pages views/day, 3 heatmaps, data stored for 3 months,...
Cognalys.com
Freemium mobile number verification through an innovative and reliable method than using SMS gateway. Free 10 tries and 15 verifications/day
Numverify.com
Global phone number validation and lookup JSON API. 250 API requests/month
Braintreepayments.com
Credit Card, Paypal, Venmo, Bitcoin, Apple Pay,... integration. Single and Recurrent Payments. First USD 50,000 free
Currencylayer.com
Reliable Exchange Rates and Currency Conversion for your Business, 1,000 API requests/month free
Vatlayer.com
Instant VAT number validation and EU VAT rates API, free 100 API requests/month
Fraudlabspro.com
Help merchants to prevent payment fraud and chargebacks. Free Micro Plan available with 500 queries/month.
Openshift.com
Container platform based on Docker and Kubernetes. Free for 2 vCPU, 1GiB Memory, 1GiB Storage.
Docker Cloud
Manages the deployments of Docker containers to your (separate) cloud environment with one free repository
Docker Hub
One free private repository and unlimited public repositories to build and store Docker images
Canister.io
20 free private repositories for developers, 30 free private repositories for teams to build and store Docker images
PWD
lay with Docker. A simple, interactive and fun playground to learn Docker
Apichangelog.com
Subscribe to be notified each time API Documentation is updated (Facebook, Twitter, Google,...)
Fullcontact.com
Help your users know more about their contacts by adding social profile into your app. 500 free Person API matches/month
Formlets.com
Online forms, unlimited single page forms/month, 100 submissions/month, email notifications
Superfeedr.com
Real-time PubSubHubbub compliant feeds, export, analytics. Free with less customization
Screenshotlayer.com
Capture highly customizable snapshots of any website. Free 100 snapshots/month
Screenshotmachine.com
Capture 100 snapshots/month, png, gif and jpg, including full-length captures, not only home page
Formspree.io
Send email using an HTTP POST request. Free tier limits to 1000 submissions per month and must expose email address in the API call.
Typeform.com
Include beautifully designed forms on websites. Free plan allows only 10 fields per form and 100 responses per month.
SurveyMonkey.com
Create online surveys. Analyze the results online. Free plan allows only 10 questions and 100 responses per survey.
Scraper API
Cloud based web scraping API handles proxies, browsers, and CAPTCHAs. Scrape any web page with a simple API call. Get started with 1000 free API calls/month.
Dreamfactory.com
Open source REST API backend for mobile, web, and IoT applications. Hook up any SQL/NoSQL database, file storage system, or external service and it instantly creates a comprehensive REST API platform with live documentation, user management,...
Parsehub.com
Extract data from dynamic sites, turn dynamic websites into APIs, 5 projects free
Algorithmia.com
Host algorithms for free. Includes free monthly allowance for running algorithms. Now with CLI support
Bigml.com
Hosted machine learning algorithms. Unlimited free tasks for development, limit of 16 MB data/task
Konghq.com/
API Marketplace and powerful tools for private and public APIs. With the free tier, some features are limited such as monitoring, alerting and support
Dominodatalab.com
Data science with support for Python, R, Spark, Hadoop, Matlab and others
Restlet.com
APISpark enables any API, application or data owner to become an API provider in minutes via an intuitive browser interface
Scrapinghub.com
Data scraping with visual interface and plugins. Free plan includes unlimited scraping on a shared server
Context.io
Create simple email webhooks and code against a free, RESTful, IMAP API to leverage email data
Apify
Web scraping and automation platform that lets you create an API extracting websites data. Free tier with 10k monthly crawls and 7 days data retention.
Diggernaut
Cloud based web scraping and data extraction platform for turning any website to the dataset or to work with it as with an API. Free plan includes 5K page requests monthly.
Colaboratory
Free web-based Python notebook environment with Nvidia Tesla K80 GPU.
Tamber
Put deep-learning powered recommendations in your app. Free 5k monthly active users.
Getawesomeness
Retrieve all amazing awesomeness from GitHub... a must see
Education.github.com
Collection of free services for students. Registration required