ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Strong.app - Strenght training logger.
Famous Engine - The Famous Engine is a free and open source JavaScript rendering engine.
Exer Studio - Your virtual workouts with real-time scores & leaderboards
FeathersJS - Wow your users. Build incredible real-time applications in record time.
HomeFitness OS - The all-in-one fitness system for Notion