If you want something open source there’s a bunch of alternatives out there. Logseq, Joplin, Zettlr, Standard Notes, etc. I prefer Obsidian since I like the UI

If you want something open source there’s a bunch of alternatives out there. Logseq, Joplin, Zettlr, Standard Notes, etc. I prefer Obsidian since I like the UI and they offer a subscription for sync, which is very convenient.