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.
Phonebot - Make phone calls from within a Slack channel
Booyah - Video chat with up to 12 friends at the same time.
Milligram - A minimalist CSS framework
Heaps - Tinder with your friends. Party in a group.