My most popular contribution to the open source community is a PHP wrapper called HighRoller for the widely used Highcharts. I wrote this while employed by Gravity.com and it’s available for free via the GravityLabs github. It’s also still featured on the Highcharts 3rd party implementations page.
Another fun project I released is called jCount, a jquery plugin counter with number formatting.
On occasion I publish some of my code to jmaclabs on github but I have not done so lately.