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Why is Trilium so unknown?
(github.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I used it for a while and right up to the point I actually set it up to give it a go, I'd never even heard of it before. Definitely feels like it flies under the radar.
I loved the idea behind it, but a few points ended up sticking out so I ended up dropping it at some point. Namely, I didn't like the markdown editor much, plus it was very awkward to use on mobile (which, granted, is an issue with most competitors). I also don't like how it's dabatase based, vastly prefer using local markdown files. Plus, it's more of a personal thing but I came to prefer graph based implementations better than hierarchical ones. Still, really impressive project and I very much appreciate that it's open source and fully self hostable, not much in the way of competition there when it comes to second brain alternatives.
After exploring a few options, I've ended up on Logseq. Shame that one isn't self hostable, not fully anyway, since last I checked you still need to open a local folder even if you do host it yourself.