[bergie]

https://gitjournal.io is one I'm using for mobile Markdown notes, synced via GitHub. Open Source.

Not exactly Obsidian Mobile, but should be close enough. The dev is tracking Obsidian compat issues: https://github.com/GitJournal/GitJournal/issues?q=is%3Aissue...

[baylessj]

This looks like a perfect fit for my use case, just downloaded it! I'm using Foam instead of Obsidian but it looks like the GitJournal author is also targeting Foam support.