Google Charts - Interactive charts for browsers and mobile devices.
Fitbod - Personalized Strength-Training powered by Machine Learning
ZingChart - ZingChart is a fast, modern, powerful JavaScript charting library for building animated, interactive charts and graphs. Bring on the big data!
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.
Highcharts - A charting library written in pure JavaScript, offering an easy way of adding interactive charts to your web site or web application
Hevy - Simple workout logging, insightful analytics, and a growing community of gym athletes.