Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.
Boostcamp - Free fitness education app for beginners
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Google Fit for iOS - Google's fitness app now available on iPhone
Milligram - A minimalist CSS framework
Keelo - Short, high intensity workouts with instructional videos