https://blog.reverberate.org/2021/04/21/musttail-efficient-i...
It's an Obsidian knock-off. It's pretty janky and the documentation is lacking. It's open-source which is nice... But the company behind it is ??? I don't know. They are Chinese but I couldn't find much about them.
I use it because I can self-host it, it has most of the features Obsidian has, and I can use it in a web-browser from anywhere - which is the biggest feature for me that Obsidian lacks.
I just hope the ingenuity will run out before their body reaches an unrecoverable state.
Usually I wouldn't care too much about a tool like this running on mobile, but not at a PC right now, so that's all I can give feedback about.