Open source. Open possibilities.

Babel is a community-driven JavaScript compiler that transforms modern JavaScript syntax into versions compatible with older environments, letting developers use the latest language features.

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.

remark is a plugin-driven markdown processor from the unified collective. It parses markdown into an AST (mdast), lets plugins inspect and transform it, and serializes it back, with 150+ plugins and a CLI for linting and formatting.

MCP server and CLI tool that gives coding agents a structural map of codebases across 20+ languages using tree-sitter, reducing token usage by up to 75% compared to grep-based exploration.

Trace (also known as T次方) is an open-source Chrome extension for website behavior tracing and deep frontend debugging. Key features include Cookie tracking, event interception, object hooking via Proxy, script injection, request blocking, variable tracking, JS deobfuscation using AST, and response stream modification through Babel plugins.

Graphify is a CLI skill that maps a codebase into a queryable knowledge graph for AI coding assistants. It uses tree-sitter for local deterministic code parsing, no embeddings, and outputs graph.html, GRAPH_REPORT.md, and graph.json.

Ditto scans JavaScript/TypeScript repositories with ts-morph, fingerprints each function through an LLM, clusters behavioural duplicates by embedding, then executes pure functions in a sandbox to show where they diverge.

High-performance code intelligence MCP server that indexes codebases into a persistent knowledge graph for AI coding agents. Supports 162 languages via tree-sitter, sub-millisecond structural queries, 15 MCP tools, and ships as a single native binary with no runtime dependencies.