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.
Onyx by Titanium - This website provides operating system utilities for macOS
Milligram - A minimalist CSS framework
Google Fit - Effortlessly track any activity. As you walk, run, or cycle throughout the day, your phone or Android Wear watch automatically logs them with Google Fit. • Get instant insights. See real-time stats for your runs, walks, and rides.
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
DeepSport - Fitness app with position tracking to help perfect your form