Fitbod - Personalized Strength-Training powered by Machine Learning

Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.

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.

MyTrails - Offline trail maps for Android (and online too!)

Strong.app - Strenght training logger.

RunnerUp - RunnerUp - A open source run tracker inspired by Garmin 410, ...