Open source. Open possibilities.

SpecScore CLI is a tool for linting, querying, and scaffolding SpecScore specifications, featuring executable acceptance scenarios and AI agent configuration.

Whitaker provides opinionated Dylint lints for Rust to enforce readable code, sensible module sizes, and avoiding panics in production. Includes nine standard lints (e.g., banning expect() outside tests, module line limits) and configurable thresholds. Supports multiple languages for diagnostics.

A framework for managing and maintaining multi-language pre-commit hooks.

CoalLedger is a docs-health checking suite for AI coding agents — the documentation counterpart to CoalMine's code canaries. Seven canaries flag wrong, incomplete, stale, contradictory, broken, unreadable and (optionally) leaked documentation, with a bundled zero-dependency CommonMark+GFM AST engine, context-judged severity and choice-gated fixes.

SwiftLint is a widely-used open-source linter for Swift code that enforces style and conventions with over 200 configurable rules, integrating with Xcode, VS Code, CI pipelines, and more.

Ruff is an extremely fast Python linter and code formatter written in Rust, designed to replace multiple tools like Flake8, Black, and isort with a single interface.

Biome is a web project toolchain offering a formatter and linter for JavaScript, TypeScript, JSX, JSON, CSS and GraphQL. It runs via CLI or as an LSP server in editors, needs no configuration by default, and is installable from npm.

ShellCheck is a GPLv3 static analysis tool for bash/sh shell scripts that flags syntax issues, semantic problems, and portability pitfalls. It runs in terminals, editors, and CI pipelines, with output formats including JSON, CheckStyle XML, and GCC-compatible warnings.

gha-doctor is a zero-config CLI that diagnoses GitHub Actions workflows for flaky jobs, wasted minutes, slow steps, cache problems and anti-patterns, with static lint rules, run-history analysis, a health score badge, auto-fixes, SARIF/HTML/JSON reports, a GitHub Action and an MCP server.

Lintro is an MIT-licensed command-line tool that brings many linters, formatters, type checkers and security scanners together under one interface, with consistent reports, auto-fixing, Docker images and optional AI-assisted review using your own API key.

Oxc is a collection of high-performance JavaScript and TypeScript tools written in Rust, designed for parsing, transformation, and linting.

Project Calavera is a CLI tool that scaffolds linters, formatters, TypeScript configs, AI agent skills, and hooks for web projects. It works standalone or alongside framework tools like Vite+, using a repeatable recipe file. Supports MCP servers for agent-first workflows.