Biome
Biome project · Testing & QA
Rust-based formatter and linter for JavaScript, TypeScript, JSX, JSON, CSS and GraphQL that replaces Prettier and ESLint with one binary
MIT OR Apache-2.0Open sourceFreeLocalNov 2, 2026
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7 tools
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draw.io
draw.io AG / JGraph Ltd · Design & prototyping
Free diagramming editor (formerly diagrams.net) for flowcharts, network, UML and architecture diagrams, available as web app, desktop app and integrations
Apache-2.0FreeOpen sourceLocalSelf-hostedNov 2, 2026
ESLint
OpenJS Foundation · Testing & QA
Pluggable static analysis tool for JavaScript and TypeScript that finds problems in code through configurable rules and can fix many automatically
MITOpen sourceFreeLocalNov 2, 2026
Lean
Lean FRO · Mathematical & statistical computing
Open-source functional programming language and interactive theorem prover with dependent types, the Mathlib mathematics library and VS Code tooling, stewarded by the Lean FRO
Apache-2.0FreeOpen sourceLocalNov 2, 2026
Prettier
Prettier project · Testing & QA
Opinionated code formatter for JavaScript, TypeScript, CSS, HTML, Markdown, YAML and more that reprints code from its syntax tree with few options
MITOpen sourceFreeLocalNov 2, 2026
R Markdown
Posit Software, PBC · Academic writing & publishing
R package that turns Markdown documents with embedded R (and Python or SQL) chunks into HTML, PDF, Word, slides, books and dashboards through knitr and Pandoc
MITFreeOpen sourceLocalMaintenanceBroken
Vitest
VoidZero / Vitest team · Testing & QA
Vite-native unit test framework for JavaScript and TypeScript with a Jest-compatible API, watch mode, coverage and browser mode
MITOpen sourceFreeLocalNov 2, 2026
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