Yep, exobrain is using org-mode export + some tweaks. I've settled on emacs + org-mode a few years ago (perhaps on the fifth attempt it finally clicked). Before it was gitit/Zim/sublime text/random scripts, whatnot. All the shiny apps like Obsidian/Roam/etc have appeared over the last couple of years (and it's awesome!). But I'm too hooked onto emacs now, maybe the only thing I should use more is org-roam [0]. For me the most useful org-mode features perhaps are tags, agenda, org-capture and org-refile. Search is very important, I have a whole post about it [1].

I started a draft describing my 'process' [2], but it's pretty incomplete.. there are some bits scattered across exobrain too.

Also lately I started playing with Logseq [3] to get a more interactive representation of exobrain [4] (warning, it's pretty heavy, needs some optimization and I might have messed up the physics). Logseq could be a great gateway for people who want to get into org-mode but not ready to go 100% Emacs, highly recommend to try it it!

[0] https://github.com/org-roam/org-roam

[1] https://beepb00p.xyz/pkm_processing.html

[2] https://beepb00p.xyz/pkm-search.html

[3] https://github.com/logseq/logseq#logseq

[4] https://beepb00p.xyz/logseq/#/graph