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

Compile systems software with a general-purpose language built around explicit control and cross-compilation.

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

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

Generate concrete syntax trees that stay responsive while source code changes.

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

A terminal-native editor built around multiple selections, syntax-aware navigation, and language-server features.

General-interest science and research stories

Science, exploration and stories about the planet

Explore Czech regions, architecture and event ideas.

Find Serbian cities, cultural sites and active-holiday ideas.

Discover Armenian cultural sites, villages and outdoor visits.

Test language support through shaping behavior as well as character coverage.

An interactive programming language for technical and numerical computing.

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

Write programmable configuration with validation and generate JSON, YAML, and other output formats.

A source and web editor with built-in HTML preview, file tools and language-server support.

Turn a concise text description into a customizable diagram with the D2 language.

North American bird identification and life-history reference

AI language tutor for conversation practice in 30+ languages

AI language tutor for speaking, listening, writing, and pronunciation practice in 130+ languages.

Practice with partners who are learning your language.

A language-course library with personal and institutional access routes.

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