Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Train Fitness - Automatically track your workout at the gym - hands free!
Supabase - An open source Firebase alternative
MoovBuddy - An exercise app for back & neck pain and joint health
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA
Apple Fitness+ - Apple Fitness+ offers 12 different workout types and new workouts and meditations every week, from 5 to 45 minutes.