Another tool to look at might be Dendron[1]. It's a VS Code plugin with similar functionality to Obsidian (according to the docs, it actually evolved from being a standalone app like Obsidian into the plugin form). My understanding is the client/plugin are FOSS, and the developer plans to implement some (optional) server-side functionality to fund ongoing development.
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[ 2.9 ms ] story [ 22.5 ms ] threadI was really looking for a local Roam Research equivalent and org-roam didn’t fit my style.
I wrote my own, if it ever gets to a point of not being terrible I will open source it as a not-as-pretty FOSS alternative.
I think the second brain notion is very powerful though, regardless of platform.
[1] https://dendron.so/