Flarum - Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.
RecordScreen.io - Record screen right from browser. No installation required.
Pairagraph - Clubhouse for the written word
Loom - Loom is a screen recording extension for Chrome that gives people the ability to create and share media. Create your own videos using your camera, screen view, and audio. Read more about Loom.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Claquette - Seamlessly record your Mac's screen, microphone and camera