So like LogSeq, Obsidian is a free note taking application which stores notes in Markdown format locally on your PC. Unlike LogSeq however, it is not open source and is designed more for long form text (LogSeq is more bullet points).

You can check out Obsidian here

In addition to the other recommendations, I like Nicole van der Hoeven for Obsidian info.

Obsidian.md, you need to import some community plugins to make it better (e.g. Advanced Tables, Multi Column, etc). But it's quite fast and powerful, it doesn't look as pretty as, say Notion, though. I love using it, you can search on youtube for some samples / tutorials, it's quite easy to use though.

I highly recommend checking out the Obsidian Discord server and Eleanor Konik's Obsidian Roundup. The community around Obsidian is insane and they're so dedicated.