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A detailed written introduction to modern C++

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.

Online courses, vocabulary review and live conversation.

A programming book with language lessons and projects

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

Teach visually with shared whiteboard pages, document presentation, and breakout-room collaboration.

A browser-based shared math canvas for handwriting, graphs, sliders, and PDF assignments.

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

Teach with an infinite, persistent whiteboard integrated into a virtual classroom.

Share a collaborative whiteboard URL and work across unlimited pages with live audio, video, and document annotation.

Sketch and teach together on a browser-based infinite whiteboard.

An online whiteboard and tutoring workspace with live drawing, chat, and media for teaching sessions.

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

Vocabulary learning with games and multiplayer competition.

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

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 video course and resource library for visual interface design

Share a live board with sticky notes, drawing tools, images, and imported or exported PDFs.

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

Camera-guided tracing onto physical paper