Top TAX GitHub Repositories & Tools (2026)

A cat(1) clone with wings.

Open-source Tax Guides for AI agents, reviewed by named CPAs/CAs/EAs. 1,000+ Guides across 190+ jurisdictions. MCP server included. Works with Claude, ChatGPT, Cursor.

Language Savant. If your repository's language is being reported incorrectly, send us a pull request!

Rich MySQL Terminal Client with AutoCompletion, Syntax Highlighting, and Dataframes

The gold standard Stax XML API implementation. Now at Github.

The PolicyEngine US Python package contains a rules engine of the US tax-benefit system, and microdata generation for microsimulation analysis.

Automated mass refactoring of source code.

Workbench for biodiversity informatics.

Manage WordPress comments, menus, options, posts, sites, terms, and users.

A native Swift editor for Code and Markdown across macOS, iPadOS, iOS, and visionOS.