ActivityWatch
Time TrackingAutomatic, privacy-first time tracking for your devices
Replaces RescueTime, ManicTime
ManicTime is a popular proprietary tool in the time tracking space. These open-source apps let you replace ManicTime with software you host and control yourself.
Moving off ManicTime means trading a managed subscription for a service you run yourself. The payoff is ownership: no per-seat pricing, no vendor lock-in, and full control of your data. Start with the option above that matches your setup-difficulty comfort level — every app links to a detailed specs page and head-to-head comparisons.