iDempiere - iDempiere Business Suite ERP/CRM/SCM done the community way.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
DataNote ERP - DataNote ERP is a complete ERP solution built for multiple industries such as construction, engineering, food and beverages, metal processing, and healthcare, among others.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
PracticePanther - PracticePanther offers CRM, invoicing, time tracking and communication solutions for law firms.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.