Obsidian

I liked it, tried it after Roam -- but it's not open source, so not sure if worth it over something like Foam.
Foam seems more easily extensible to me.
This thread was what sealed the deal, didn't make it sound like open source was likely to happen anytime soon: https://forum.obsidian.md/t/open-sourcing-of-obsidian/1515
- Go link: flancia.org/go/why-not-obsidian