A discontinued Angband variant, based off of Zangband 2.2.0, and authored by DarkGod. The last version was 5.1.2, released early 2002. It added a few details from the Pern series by Anne McCaffrey, like the Dragonrider race and some themed monsters and quests, but wasn't based on the Pern universe to any great extent.

Late February of '02, McCaffrey's son emailed the website maintainer for PernMangband (a sister variant), threatening legal action unless the game was renamed and all Pern elements were removed. (Apparently the computer game rights had been awarded to a company called Ubisoft.)

DarkGod renamed the games to T.O.M.E and TOMEnet. Over a series of releases he has erased nearly all traces of Pern, and has dramatically altered the game mechanics.

Sources:
http://t-o-m-e.net/
http://www.thangorodrim.net/pernangband.html
rec.games.roguelike.angband