SamajGaya

Just a quick screenshare? Probably Screensy

I might have not understood the exact use-case, but for using gifs or videos (via mpv) as a background there’s XWinwrap.

There are probably better forks with more functionality

A few channels that lie around a specific topics I can remember:

• jc : A professor at IITK, has highly informational videos for aspiring students in the context of motivation and studying for examinations.
• No boilerplate : Videos on increasing productivity and the occasional rustacean (programming) shilling.
• Ryan Chapman : Mainly long format information rich video essays related to politics/political systems and how they came to be.

The topics they cover are highly specific and cater not that large an audience but the quality of the content is quite c.ommendable.