Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Timewatch - Timewatch offers time tracking, expense management, resource scheduling and professional services automation solutions.
Basecamp - A simple and elegant project management system.
Office Timesheets - Professional Services Automation
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
Krow - Krow Software is a professional service automation solution.