I can't really help but suggest Epilogue.
DCSS (Dungeon Crawl Stone Soup) is probably my favorite, along with Tome4 in terms of the big ones.
There is also Infra Arcana which is somewhere between tiles and ascii.
Tome4 has some similarities to Elona in terms of the world being the same every time, but on the other hand Powder is more similar in terms of Nethackiness. Elona is quite unique so it'll be difficult to find another game quite like it.