StayFocusd increases your productivity by limiting the amount of time that you can spend on time-wasting websites.

TimeCamp is an advanced time-tracking app which also offers a variety of reporting, billing, and invoicing features.

Freelancy is a time tracker, project management and invoicing software for individuals and teams.

taskblitz is set of tools to collaboratively get your work done including project management, chat, time tracking and invoicing.