A new one I was recommended the other day: UnEpic World. It's also on Steam and itch.io, started development in 1992! By Fins!
I see Errka has recently released "Ancient Savo", which looks somewhat like a rewrite of URW:
https://enormous-elk.itch.io/ancient-savo
Here he is celebrating the release.
https://www.enormouselk.com/sites/default/files/styles/w730/...
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And yes, mainline angband is still under active development. There are a couple of very popular variants too (frogcomposband and sil-q.)
A new one I was recommended the other day: UnEpic World. It's also on Steam and itch.io, started development in 1992! By Fins!