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.
Qbserve - Freelance time tracking, invoicing, and productivity improvement
Freelancer Resources List - The biggest collection of free resources for freelancers
Klokki for Mac - Rule-based automatic time-tracking
Bonsai - One platform to streamline your entire business
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.
Startup Stash - A curated directory of 400 resources & tools for startups