Well, I plan on remaking quite a few myself. This list is subject to change though
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Wolfenstein 3D: The Way of the Gun - E1L9Q3 (remake of E1L9, Hans Grosse)
Quake II: Of Flesh and Cogs - Q2BOSS2Q3 (remake of BOSS2, The Final Showdown)
Doom: South of Heaven - E4M1Q3 (remake of E4M1, Hell Beneath)
Quake III Arena: Warlords of Jupiter - MRNULLQ3DM1 (undecided space-floater, original art deco design)
Quake: Twilight of the Gods - Q1ENDQ3 (remake of END, Shub-Niggurath's Lair)
Quake II: Disposable Heros - Q2BIGGUNQ3 (remake of BIGGUN, Big Gun)
Doom II: The Waking Wrath - D2M30Q3 (Remake of Level 4, Focus)
Quake II: Children of the Fallout - Q2DM4Q3 (remake of Q2DM4, Lost Hallways)
Wolfenstein 3D: Beyond the Wall of Sleep - E5L9Q3 (remake of E5L9, Gretel Grosse)
Quake: Black Illusion - Q1E1M6Q3 (remake of E1M6, The Door to Chthon)
Quake II: Soul Creation - Q2FACT3Q3 (remake of FACT3, Sudden Death)
Quake II: House of the Rising Sun - Q2SECURITYQ3 (remake of SECURITY, Grid Control)
Quake: Resurrection - Q1STARTQ3 (remake of START)