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

A programming problem archive with difficulty guidance

A Clojure learning book with further programming resources

Explore an interpreted object-oriented language for web applications, scripts, and text-processing tasks.

Programming contests with a permanent practice entry point

Illustrated programming lessons with browser coding practice

An engineering programming environment for developing algorithms, analyzing data, and visualizing results.

Interactive coding lessons leading into projects

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

A beginner-focused Python IDE that makes variables and program execution visible while you learn.

Compare source files by syntax structure rather than relying only on line-oriented diffs.

A modal, configurable text editor for programming and general text work.

Define AWS infrastructure in familiar programming languages and synthesize deployable applications.

An immersive Smalltalk environment where a live image, code tools, and debugger support immediate feedback.

Design mobile app screens in a browser and program their behavior by assembling visual blocks.

A browser-only Jupyter distribution for running interactive notebooks from static web files.

A transactional hierarchical key-value database with interfaces for multiple programming languages.

Build apps, command-line tools, and services with Swift's compiled programming language.

A beginner-focused BASIC IDE with instant graphics, a step debugger, and a browser-based WebAssembly edition.

Work with notebooks, code files, consoles, and terminals in a browser-based interactive development environment.

Turn an OpenAPI description into interactive reference docs and a collaborative developer hub.

A tutoring classroom with an interactive whiteboard for annotating PDFs, worksheets, slides, and images together.

Make interactive art and visual projects for the web with a JavaScript creative-coding library.

Build interactive Python applications for the terminal with widgets, CSS, and keyboard bindings.