Open source. Open possibilities.

YAPF is a configurable Python code formatter based on the clang-format algorithm that automatically reformats code to conform to a specified style guide.

A pure-Go shell parser, formatter and interpreter supporting POSIX Shell, Bash, Zsh and mksh, best known for the shfmt formatting tool.

Prettier is an opinionated code formatter that parses code and reprints it with consistent rules, taking maximum line length into account and wrapping when needed. It can run in editors on save, pre-commit hooks, or CI.

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.

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.

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.

Black is an opinionated Python code formatter that reformats entire files in place with minimal configuration, producing deterministic, PEP 8 compliant style and the smallest possible diffs.

A self-contained PHP class for converting strings into various named formats, including common programming casing and specialized identifiers.