Nextcloud Bookmarks
★★★★☆
Online web app for managing your bookmarks using your own Nextcloud server. You can save pages to it using a bookmarklet on a desktop web browser, and you can install it to your home screen on a phone. There are also mobile apps that can connect to it.
Usually I use it indirectly through Floccus Bookmark Sync, which can use this as the online storage to sync across multiple desktop web browsers.
The main web view of the app is a bit slow and unwieldy, especially on lower-spec hardware (like VMs and the PineTab2), but that’s not so much the fault of the Bookmarks app as it is the design of the general Nextcloud UI. One of these days I’ll get around to writing a script that exports it to HTML for use with Dillo, or syncs it to Falkon bookmarks. (Falkon can handle it just fine on faster hardware, but I mostly use it on slower systems.)
I also had to block it from allowing network access so it wouldn’t check every bookmark for broken links - including some that really shouldn’t be spidered!
There are several Android apps that can sync with Nextcloud Bookmarks. I settled on the mobile version of Floccus since, well, I was already using it.
More info at Nextcloud Bookmarks.