I'm curious -- Roam Research appears to have won over a lot of folks with this kind of need recently. You didn't list Roam among the prior art -- do you think it's not really relevant? I can certainly see Roam eventually including cross-platform bookmarking/archiving, etc.
By the way, I think you should also take a look at Archive Box, which is very much in this direction: https://archivebox.io/
You mean, I didn't include it as prior art for Promnesia or Grasp project?
For Promnesia, the goals of Roam and Promnesia are pretty different at the moment (although Roam data can be used with Promnesia, as I mentioned). In addition, I can't personally bet on a closed source tool.
For Grasp, simply because Roam wasn't known (or possibly didn't even exist!) when I wrote it. But even now that I tried Roam now, I don't think I can go back from using plaintext files, it's just so much snappier and more hackable.
Thanks, I used archivebox! Still need to set up a proper automatic archiving, and integration Promnesia with personal web archives is also in my plans!
By the way, I think you should also take a look at Archive Box, which is very much in this direction: https://archivebox.io/