This one is better imo https://lemmyverse.net/

I always thought it was open source since they have a repo in Github. I also really love Obsidian. It’s a really great app for any kind of notetaking, not to mention it uses markdown which can be read by any text editor. It also works really well with Syncthing, so my data is completely local. Well, if enshittification also happens to Obsidian, I’ll try to find other apps instead.