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Environments for training AI and agents that handle recurring engineering work

Graded Chinese stories with audio and word support.

Chinese graded reading with audio and contextual lookup.

European Portuguese courses, stories and audio.

Short English news with graded text and audio.

Chinese reading through graded news-based lessons.

Turns any subject into a structured course with five tiers and hands-on labs.

Piano learning with songs and graded exercises

German reading with difficulty labels and vocabulary explanations.

Build domain-specific languages with a projectional editor, language tools, and code generators.

English lessons built around news at several levels.

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

Explore data and create statistical summaries and graphics in R's language environment.

Use a compact scripting language on its own or embed its interpreter through a documented C API.

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

Build type-safe concurrent programs for the Erlang virtual machine or compile them to JavaScript.

AI language tutor for speaking practice and pronunciation feedback.

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

Build JVM and multiplatform applications with an open-source language and compiler toolchain.

Share columnar in-memory data across languages with a common format and library ecosystem.

Automate text-heavy tasks and build scripts with Perl's mature language and module ecosystem.

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.