FreelanceStation is a time tracking app for Mac specifically designed and built for freelancers. It has everything you need to work: easy manual time tracking, client, project and task management, estimate and invoice generation, payment recording and transaction exporting to accounting software.
Klokki for Mac - Rule-based automatic time-tracking
Timemator - Automate your time-tracking and forget about the timer. Forever! Create your rules — tell Timemator which files you’re working on or what applications you use for your work... read more.
Time Tracking for Freelancers - A simple, fully integrated time tracker for freelancers
Qbserve - Freelance time tracking, invoicing, and productivity improvement
Time 2 - Stay focused and crush procrastination
Forest App - Forest is an app that helps you stay focused on the important things in life.