Power Time is a time management system written in Python which uses the Django web framework for access and information display. It allows you to:
Charge different clients different hourly rates. Charge for different rates based on employee working on a project. Charge hourly or set prices for different projects. Automatically notify your clients when their bills come due. Track payments received, paychecks sent, and bills paid. Keep track of communications with clients. And much more. If you know Python and Django, it's also very easy to customize and extend.