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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6 tools
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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
Playwright
Microsoft · Testing & QA
Microsoft's browser automation and end-to-end testing framework driving Chromium, Firefox and WebKit from one API in TypeScript, Python, Java and .NET
Apache-2.0Open sourceFreeLocalSelf-hostedNov 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
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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