They don't mention it as one of their inspirations but this also looks like a cool open source alternative to Obsidian. Although I don't think Logseq has a mobile app which i really love for Obsidian.
It has a 1st party mobile app for Android and iOS right on the main download page (https://logseq.com/downloads).
I use the android app and it's ok. Still has some work to do, but honestly trying to handle the complexity of logseq style editing in a mobile app is rough, so I mostly just use it for rough note taking that I clean up on desktop later