Office Timesheets - Professional Services Automation
Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...
HarmonyPSA - HarmonyPSA - Professional Services Automation (PSA) for IT Businesses
16bugs - 16bugs is an all-in-one bug tracking software that makes it easier for you to manage all sorts of bugs in performance with the simple interface; ultimately, you will be more productive for sure.
Timewatch - Timewatch offers time tracking, expense management, resource scheduling and professional services automation solutions.
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.