Strong.app - Strenght training logger.
wger - FLOSS workout, fitness and weight manager/tracker written with Django
HomeFitness OS - The all-in-one fitness system for Notion
Liftosaur - Free weightlifting tracking app where you can code
Tinygain - Create, discover and develop productive daily routines.
JEFIT - Jefit is the #1 popular gym workout app for Android and iOS. Jefit allows you to manage your training routine and keep track of your workout progress easily.