Hello /v/, I'm trying to compile a list of source ports and modern interpreters of old titles. This is what I've got so far. I would turn this into a nifty chart if I knew how.
>Commander Keen Series - Commander Genius (http://clonekeenplus.sourceforge.net/)
>Descent, Descent 2 - DXX-Rebirth (https://www.dxx-rebirth.com/) D2X-XL (http://www.descent2.de/d2x.html)
>Doom - Chocolate Doom (https://www.chocolate-doom.org/) GZDoom (https://zdoom.org/)
>Doom 64 - Doom 64 EX (https://doom64ex.wordpress.com/)
>Duke Nukem 3D - EDuke32 (http://www.eduke32.com/)
>Dune 2 - Dune Legacy (https://sourceforge.net/projects/dunelegacy/)
>Hexen II - Hexen II: Hammer of Thyrion (https://sourceforge.net/projects/uhexen2/)
>RollerCoaster Tycoon 2 - OpenRCT2 (https://openrct2.org/)
>Tyrian - OpenTyrian (https://bitbucket.org/opentyrian/opentyrian)
>Transport Tycoon Deluxe - OpenTTD (https://www.openttd.org/)
>X-COM UFO Defense - OpenXcom (https://openxcom.org/)
>Powerslave - Powerslave EX (https://powerslaveex.wordpress.com/) (http://www.mediafire.com/download/z8pba9xnxzjjv2s/Powerslave+EX+v.1.0.0+%2B+patch+v.1.0.1.7z)
>Quake - Quakespasm (http://quakespasm.sourceforge.net/)
>Quake II - QuakeIIXP (http://quake2xp.sourceforge.net/)
>ScummVM - Multiple adventure titles (LucasArts, Sierra, etc)
>Ultima Underworld - Abysmal Engine (ABANDONED) (https://sourceforge.net/projects/abysmal/)
>Ultima IV - xu4 (http://xu4.sourceforge.net/) + U4 Upgrade Release 1.3 (http://www.moongates.com/u4/upgrade/files/u4upgrad.zip)
>Ultima VI, Ultima Worlds of Adventure - Nuvie (http://nuvie.sourceforge.net/)
>Ultima VII - Exult (http://exult.sourceforge.net/)