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A browser IDE for running short code samples or building supported multi-file projects across many languages.

A browser-based Dart and Flutter workbench for running small programs and UI samples.

A browser editor for micro:bit projects with Blocks, JavaScript, Python, and a device simulator.

A Java teaching IDE where learners program actors and see their code run inside interactive worlds.

Online programs and short courses for working learners.

Offline strength logging with local records and an automatic rest timer

Build interactive terminal applications in Go with an event-driven model, update, and view loop.

Build native programs with Rust and manage their packages and builds through Cargo.

Write statically typed Nim programs and compile them with a toolchain designed for systems and application work.

Build interactive terminal interfaces in Rust with reusable widgets and responsive layouts.

Design OpenAPI descriptions, create API documentation and validate designs in a visual workspace.

Encrypt files or streams with explicit recipients and a small command-line interface.

Compile C, C++, and other supported languages into programs for native and cross-target systems.

Drive a chosen rate of HTTP requests and turn response samples into load-test reports.

Run Python programs and isolate project packages with the official CPython interpreter.

Write visual sketches in a desktop editor and run them in a graphics window with Processing.

Compile Ruby-inspired, statically typed Crystal programs into native executables.

A fantasy console with a compact Lua coding environment and built-in sprite, map, sound, and music editors.

Create compiled programs and reusable modules with Go's language and standard toolchain.

Transform Python array functions with just-in-time compilation, automatic differentiation, and vectorization.

A macOS programming editor that runs and debugs code in many languages from one desktop app.

A dynamic programming language with an interactive development workflow and a JVM-based library ecosystem.

Build trading tools and examine cBot behaviour on historical data

Build web pages and command-line programs with a general-purpose scripting language and interpreter.