IDE and Code Editing

Android Studio provides the fastest tools for building apps on every type of Android device. Open Source IDE is free for everyone and the best Android app development. Available for Windows, Mac, Linux, and even ChromeOS!

An Open Source IDE to develop real, Gradle-based Android applications on Android devices.

Development Environment, Tooling Platform and Application Framework.

Collaborative design API with instant API mock and generated documentation (Free for unlimited API blueprints and unlimited users with one admin account and hosted documentation).

BBEdit is a popular and extensible editor for macOS. Free Mode provides a [powerful core feature set](https://www.barebones.com/products/bbedit/comparison.html) and an upgrade path to advanced features.

Turn a Git repo into a collection of interactive notebooks. It is a free public service.

A free Java Development Environment designed for beginners, used by millions worldwide. Powered by Oracle & simple GUI to help beginners.

Brackets is an open-source text editor specifically designed for web development. It is lightweight, easy to use, and highly customizable.

Code snippet organizer with labels and support for 100+ programming languages.

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.

Free Fortran & C/C++ IDE. Open Source and runs on Windows,macOS & Linux.

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

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

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](https://workspaces.openshift.com/).

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.

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

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.

Productivity tools, IDEs and deploy tools (aka [IntelliJ IDEA](https://www.jetbrains.com/idea/), [PyCharm](https://www.jetbrains.com/pycharm/), etc). Free license for students, teachers, Open Source and user groups.

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.

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

A free AI-powered cloud-based IDE.

Tiny API mocking microservice for generating fake JSON data.

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.

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

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

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

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!

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 needed.

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.

Online development environment for PHP

A cloud coding environment for various program languages.

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 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.

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](https://node.new).

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

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

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).

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

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

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.