Originally 'The Nullspace', was a map submitted for Quake Brutalist Jam 2 by ExaByt. This is an expansion of it into a mini-episode consisting of 4 maps (including the original Nullspace, slightly updated/rebalanced), and a start map.
Earthless is planned to be a complete 32-level project by James Paddock (Jimmy), with skies and sprites made by Fuzzball. It is the spiritual successor to Deathless.
The project from iddqd.ru the community, basis of which are maps, made in a speed- mapping course, on which only 4 hours were allowed (each speedmapping contest - 4 hours length). Of the 33 maps in this megawad, all but 14 were part of these speedmapping contests.
This is a five map hub for Zdoom (recommend playing in GZDOOM). The Gameplay is largely arena based with some hard fights thrown in to try and challenge players.
Realm of Shades is a episode replacement PWAD for Doom II created by Pedro Francisco Puicón (NokturnuS). It is NokturnuS' first public release, and is an episode containing seven levels utilizing some custom textures.