The Track - Customizable time tracking app for macOS, Windows, and Linux
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
JadeTrack - Environmental Management
Hours - Boosting productivity through live, virtual co-working.
Freework - An easy way to keep track of your daily work
Futuramo Time Tracker - Futuramo Time Tracker is a time tracking solutions designed for freelancers and teams.