WADs in idGames, ZDOOM
Dawn: A Prelude
5-level prequel to The Darkest Hour, which is set in the Star Wars universe. Wrok Onmo is in an Imperial Penal Colony on the Lodai Asteroid. His gang breaks him out so that he can travel to the fortified palace of Quatto the Hutt, who wants to commission him to steal the plans to an Imperial Cybernetics Facility.
Okay, for starters: THIS LEVEL IS LARGE. VERY, VERY, VERY LARGE. It has ~2400 sectors and ~2300 monsters on UV. I would NOT recommend playing this level if you have a really old computer. Second, this map is pretty hard. 100% kills and secrets on skill 4 is possible, but difficult (I've done it with a lot of saving and reloading). Other than that, it's fun with a lot of action. So enjoy it!
Eternal DOOM IV: Return from Oblivion
All maps are: (i) medieval-themed, and generally very large compared to typical DooM maps; (ii) non-linear and feature multiple paths; (iii) feature castle and fortress architecture, fights on an epic scale, and magnificent vistas. Maps 08-10 can be played in any order within the hub, and powerups & enemies are different in any given map depending on whether you play it first or play it after entering from another map. This provides additional replay value. This is a 7-map demo. TeamTNT intends to create a full megawad next. Tested with ZDooM and GZDooM
Fish! (release 4)
My own (probably ill-advised) attempt to counter Justin Fisher's [*] opinion that PWADs based on the concept of rooms that form words are boring and unimaginative. I dare say most of them are but it was a nice little challenge anyway. [* JF of Aliens-TC fame, that is.] This is a relatively small level, but has some neat touches I think. "Fish" is the despised pet name by which my little brother was known. Scroll down for tips.