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).

Code components in isolation, visualize them in stories, test them, and publish them on npm.

An open-source client-side code playground that supports 90+ languages/frameworks. Projects can be saved, exported, shared, synced, deployed (to GitHub Pages) and embedded in web pages. Mobile-friendly. Can be self-hosted. Free for unlimited usage. No account required.

Wave is an open-source, cross-platform terminal for seamless workflows. Render anything inline. Save sessions and history. Powered by open web standards. MacOS and Linux. ⬆️ Back to Top

Quantified self-metrics about your coding activity using text editor plugins, limited plan for free.

Community-driven, without telemetry/tracking, and freely-licensed binary distribution of Microsoft’s editor VSCode

Code editor redefined and optimized for building and debugging modern web and cloud applications. Developed by Microsoft.

Sublime Text is a popular, versatile, and highly customizable text editor used for coding and text editing tasks.

Online/Cloud Code IDE to create, edit, & deploy full-stack apps. Support any popular NodeJs-based frontend & backend frameworks. Shortlink to create a new project: https://node.new.

A cloud programming playground well-suited for running code snippets. Supports various programming languages. No registration is required for running code, but it is necessary when saving code on their platform. Also offers free courses for beginners and intermediate-level coders.

GPU-accelerated numerical computing IDE in the browser. Write and run MATLAB-syntax .m files with automatic GPU acceleration via WebAssembly and WebGPU. No install, no account, no license fees. Open source runtime with CLI, NPM package, and Jupyter kernel support.

A cloud coding environment for various program languages.

Online development environment for PHP

Develop Web apps in Browser without needing to set up anything. Free Plan offers one server with 24 24-hour lifetime and 4 hours of running time per day with 2 CPU cores, 2 GB RAM, and 1 GB storage.

a free opensource browser-based coding environment for front-end developers. write html, css and js with a vs code-grade editor (monaco), live preview, scss/typeScript/babel support, and an ai chat assistant for debugging and suggestions. all projects save to local storage. free forever – no account

A free online ide thats supports 40+ languages and is pre installed with tons of libraries; and also has a debugging option, flags, tutorials, and a QNA page!

Free online compiler supporting 70+ languages including Java, Python, C++, JavaScript.

an HTTP-based mock API simulator that helps simulate APIs for faster parallel development and more comprehensive testing, with a lifetime free tier.

Mockaroo lets you generate realistic test data in CSV, JSON, SQL, and Excel formats. You can also create mocks for back-end API.

Tiny API mocking microservice for generating fake JSON data.

A free AI-powered cloud-based IDE.

Lazarus is a Delphi-compatible cross-platform IDE for Rapid Application Development.

Some 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.

Productivity tools, IDEs and deploy tools (aka IntelliJ IDEA, PyCharm, etc). Free license for students, teachers, Open Source and user groups.

Online compiler and editor for more than 60 programming languages with a free plan for REST API code compiling up to 200 credits per day.

Instant free Linux and IDEs chrome sidebar. The free tier includes 5 VMs per day.

AI-enabled pair programmer for Claude, GPT4 Series, Grok, Deepseek, Gemini and all frontier models. Works natively with your CLI and integrates seamlessly with any IDE. Free tier includes basic AI model access with local processing.

Web-based and Kubernetes-Native IDE for Developer Teams with multi-language support. Open Source and community-driven. An online instance hosted by Red Hat is available at workspaces.openshift.com.

Coding Assistant that lets you search, define, and reuse code snippets directly in your IDE. Free for individual and small organizations.

Free browser IDE and playgrounds for 15+ languages plus Postgres, MySQL, MongoDB, and Redis. Shareable snippets, coding interviews, and cloud workspaces. Free playgrounds need no install.