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.

Timeglass - Multi-step & spoken timers for your workouts & cooking.

Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.

Workout Timer - A simple, customizable workout timer

Cattr - Cattr is a free open-source self-hosted time tracker with desktop clients for windows, mac, linux.

WorkoutSesh - Free workout routines with interval timer