myTube - Windows YouTube player that keeps your video playing no matter what.
Documize - Enterprise-grade wiki and knowledge management platform
FreeTube - FreeTube is an open source desktop YouTube player built with privacy in mind.
HackMD - Fast and flexible, real-time collaborative markdown, inspired by Hackpad.
NewPipe - NewPipe is a lightweight YouTube front-end for Android.
ReadTheDocs - Spend your time on writing high quality documentation, not on the tools to make your documentation work.