1994 Tune-up Community Project (1994TU.WAD)

The 1994 Tune-up Community Project started with a simple concept. The general opinion of WADs from Doom's earliest era is not glowing; most 1994 maps are considered crude by today's standards. The disparity in appearance and playability is attributable to any number of sources, but Doomworld forum superstar Snarboo presented an interesting idea for a project, assisted along by GreyGhost and Travers Dunne. Rather than bitch about how awful '94 WADs are, why not take the ones authors released free to modify and renovate them? The target was limit-removing and Boom-compatible, freeing mappers from the dreaded visplane specter and allowing for a limited number of "advanced" features. The only caveat was to avoid rendering the layouts of the original maps unrecognizable, though contributors were free to make their own additions, provided they not increase the map's size by more than 100%. As a general rule.

Doom 2 Unleashed (PC_CP.WAD)

Paul Corfiatis is a veteran Doom mapper, the author of ancient WADs like The Twilight Zone. Upon releasing his Whispers of Satan megaWAD with best Doom buddy Kristian Aro, he opted to start a community project, which debuted in 2011 as Doom 2 Unleashed. It's a forty map megaWAD whose last eight levels constitute their own episode, titled "No Hope for Peace". The scope of the project was restricted to maps that functioned in any limit-removing port and used only stock Doom II textures. I'm not entirely sure how the bonus episode is handled outside of ports that support maps in excess of 32, let alone custom episode definitions, but in ZDoom NHFP shows up as a selectable episode, backed by the soundtrack from Inferno.