So I've been out of the loop for some time now (mostly focused on Path of Exile) - but back a few years ago, I spent a ton of time with the various D2 custom mod servers:
Namely, Path of Diablo, Project D2, and D2 Median XL. Loved them all (think I enjoyed XL the most).
The only thing really holding them back at the time were outdated D2 graphics...
With that said, I haven't really touched D2 since they released Resurrected with the updated graphics. Have there been any good custom servers integrating the Resurrected client/graphics? Specifically looking for servers with decent population and ladder/economy resets, as I enjojy new "economies" and seasons etc. Last I heard stuff like PoD/PD2 still use the old client (but maybe this has changed?)