ActivityWatch - Open-source time tracker
Time tracking
Timing
Chronoid
Taim: Automated Time Tracking for Accurate Billing
Timemator for Mac — Automate your time-tracking and forget about the timer. Forever.
Tyme
Time tracking without being a pain
Balance: Mindful time tracking by Alexander Sandberg
Harpoon | Simple time tracking on your Mac desktop
RescueTime: Automatic Time-Tracking Software
Rize · Maximize Your Productivity