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

Write text descriptions and render them as UML and other technical diagrams.

An open-source desktop notebook for stylus handwriting, PDF markup, layers, and audio notes.

A lightweight programmer's editor for website files, scripts, and source code.

Continuously fuzz accepted open-source projects to find crashes and other input-handling bugs.

A privacy-first, open-source knowledge base for structured personal notes.

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

Manage versioned files with a distributed source-control tool and a concise command-line workflow.

A desktop note environment for Markdown, source files, mind maps, PDFs, and other formats.

A community-developed, open-source font editor.

Convert AsciiDoc source into HTML and other publishing formats with the Ruby-based reference implementation.

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

Edit source files and send build or run output to an integrated pane on Windows or Linux.

Sentry-SDK-compatible error monitoring, available hosted or self-hosted.

Keep reading notes, quotations, analysis, and source details beside the writing they inform.

Compile C, C++, and other supported languages into programs for native and cross-target systems.

Track project history locally, branch freely, and share selected commits with collaborators.

Track app and website activity locally with a free open-source time tracker.

Run Python programs and isolate project packages with the official CPython interpreter.

Add interactive, mobile-friendly maps to a web page with a JavaScript library.

Draw together in real time on a free, open-source online whiteboard.

Summarize files, code, comments, and blank lines across a project by programming language.

Configure native-code builds in a separate build directory, then compile and run registered tests.

Run containerized apps, source builds, functions and batch jobs on IBM's managed serverless runtime.