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.
Houseparty - Brining empathy to online communication.
Material UI - A CSS Framework and a Set of React Components that Implement Google's Material Design
Booyah - Video chat with up to 12 friends at the same time.
Milligram - A minimalist CSS framework
Airtime - Hang out with group video, share music & videos