timeBuzzer - timeBuzzer enables freelancers and project-driven teams to track their time at the touch of a button, understand where their time goes and create reports with just a few clicks.
TopTracker - Beautiful, free time tracking
Traqq - Team time tracker with dynamic screenshots, productivity metrics, and apps & website tracking. Track hours within seconds with Traqq's simple UI and lightweight app.
Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.
SaveMyTime - Get rid of wasted time to make space for New Year’s Goals
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.