I wrote a blog article about creating a second brain some time ago. It’s meant mostly for programmers, but the concepts hold true for other people as well :) https://blog.sewera.dev/second-brain

You can also try VSCodium with Foam, I think both are FOSS. You can read a bit about this setup on my blog: https://blog.sewera.dev/second-brain

Something like this? https://github.com/tiquthon/onion-or-not-the-onion-drinking-game-2

Some time ago this was also up, but now it isn’t: https://github.com/SchaeStewart/OnionOrNot

Basically this search: https://github.com/search?q=onion+not+onion+game&type=repositories&s=updated&o=desc