Interesting to see this kinds of tools get so much attention in the past couple of months!

I have seen a lot of buzz around Roam (which is interesting given how outright terrible the initial user experience and conversion funnel is - I did not have the patience and unsub'd immediately..)

I ended up buying https://zettelkasten.de/the-archive/ Super straightforward Zettelkasten system, and most importantly utilizing plain txt and not some weird proprietary format.