Software

jqjs, a JavaScript implementation of the jq query language, implementing the core language features in pure JavaScript that runs in the browser or Node, with over 90,000 installs.
dragon, a drag and drop source/target for X11. dragon file.jpg creates a window with a single entry you can drag into a file manager or web browser.
A tool to generate accurate Windows 3.x dither patterns in-browser.
Multiple implementations of the Grace language.
A regular expression analyser that runs in the browser, showing both NFA and DFA for a regex and simulating them against strings.
Cromavor, a shareware MS-DOS game created for the 2025 DOS Game Jam; also playable emulated in-browser under dosbox-js.