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Organize a personal knowledge base with block-level notes, references, and bidirectional links.

A Java IDE that lets learners explore classes and objects while writing code.

A Windows C development kit that packages an optimizing compiler, project IDE, debugger and resource editors.

A shared interface toolkit with explicit versioned documentation

React components implementing Uber’s Base design language

An Android-first notebook for handwriting, PDF markup, voice notes, and optional web sync.

Free browser-based team chat for startup groups, channels, and voice or video calls.

Publish a Markdown-first documentation website from project files.

A team chat with channels, private messages, open voice rooms, and AI helpers.

Apply structured code-migration recipes across Maven and Gradle projects, then review the changed files.

Load project-specific environment variables when entering a directory, then unload them when leaving.

A free, local-first Markdown notebook for macOS and Windows.

An approachable JavaScript framework for building interactive user interfaces.

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

Compile suitable Python numerical functions to machine code when they are first called.

Define and validate data and configuration with a language that combines values and constraints.

A local Markdown notebook that maps the path between connected ideas.

Call OpenAI models and tools from an application through the developer API.

Official ACT preparation options with study resources and a route to MyACT.

A real-time visual collaboration canvas with voice chat, diagrams, and self-hosting options.

Build reactive web applications in Rust with client-side or server-side rendering.

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

Build web and native user interfaces from reusable components.

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