Fitbod - Personalized Strength-Training powered by Machine Learning
Gyroscope - Gyroscope is a personalized dashboard for tracking your life.
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.
CareKit by Apple - Open source software framework for creating health apps
Strong.app - Strenght training logger.
DNScapy - DNScapy is a DNS tunneling tool. The code is very light and written in Python.