Timeglass - Multi-step & spoken timers for your workouts & cooking.
Strong.app - Strenght training logger.
Workout Timer - A simple, customizable workout timer
wger - FLOSS workout, fitness and weight manager/tracker written with Django
WorkoutSesh - Free workout routines with interval timer
Bolt - Workout Tracker - Track your progress in the gym and discover new workouts with the most intuitive workout tracker for weight lifting on the App Store.