- JUST is an open-source handy way to save and run project-specific commands. Inspired by Make, JUST is a command runner.
- The Jargon File is a comprehensive compendium of hacker slang illuminating many aspects of hack-ish tradition, folklore, and humor.
- Jampack is an open-source package that optimizes static websites for best user experience and best Core Web Vitals scores.
- Jan is an open source alternative to ChatGPT that runs 100% offline on your computer.