This is an incomplete list of third-party projects that the jQuery Foundation contributes to.

• https://github.com/mdevils/node-jscs
• https://github.com/millermedeiros/esformatter/
• https://github.com/Polymer/PointerEvents
• https://github.com/gruntjs/grunt
• https://github.com/w3c/web-platform-tests
• https://github.com/stubbornella/csslint
• https://github.com/jsbin/jsbin
• https://github.com/wycats/handlebars.js
• https://github.com/h5bp/html5-boilerplate
• https://github.com/gseguin/grunt-hash-manifest
• https://github.com/rxaviers/cldr
• https://github.com/rwaldron/tc39-notes/
• https://github.com/tc39/test262

A bunch more in here, in the later sections: https://gist.github.com/scottgonzalez/5f7522905560eeadeeb2