Google Open Source - All of Googles open source projects under a single umbrella
TimeSite Pro - TimeSite Pro is a fully configurable, cloud-based time tracking, expense & invoicing solution.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
WiseTime - Web-based automatic time tracking software
Open Source @IFTTT - A collection of IFTTT OSS projects.
TimeSolv - Legal Time Tracking & Billing Software.