> Instead of creating yet another mediocre cheat sheet repository, we are concentrating our efforts on creation of a unified mechanism to access selected existing well developed and good maintained cheat sheet repositories covering topics of our interest: programming and operating systems usage.

https://github.com/chubin/cheat.sh

There’s also http://bropages.org

I use this all the time. It's very good.

It has clients in multiple languages, like

https://github.com/tldr-pages/tldr-python-client

https://explainshell.com is sort of a reverse

The cheat sheet project also takes data from tldr.