Significant Port Feature     Pioneering Source Port  Note
---------------------------  ----------------------  --------------------------
3D Floors                    RORDoom*, EDGE          * Not released to public
3DMidTex*                    The Eternity Engine     * Not incl. Strife railing
3D Object Clipping           ZDoom*                  * Raven-derived implem.
ACS Scripting                ZDoom
Anchored Portals             The Eternity Engine
Basic Limits Removal         BOOM
Built-in DeHackEd            BOOM, Legacy, DosDoom?  * Unknown which first?
C++ Port                     ZDoom
Client/Server Netcode        csDoom
Console                      Doom Legacy?
CTF                          CTFDoom?
Custom Line Action Bindings  ZDoom
Custom Scripting Language    DosDoom (RTS)
Doom 64 Support              Doom 64 EX*             * Replaces normal logic
Dynamic Content Language     EDGE (DDF)
Dynamic Segs                 The Eternity Engine
ENDOOM Emulation (Non-DOS)   Chocolate Doom
Floating-Point Renderer*     The Eternity Engine     * Software
Friendly AI*                 MBF                     * non-Strife ALLY
Generalized Sector Types     BOOM
GL Nodes                     EDGE/Vavoom*            * Collaborative dev
Heretic Playable             ZDoom
Hexen Map Format             ZDoom
Hexen Playable               ZDoom
Java Port                    Mocha Doom
Map Info Lump                ????
Multi-Threaded Rendering     Mocha Doom
Native Master Levels Supp.   The Eternity Engine
Native NR4TL Support         The Eternity Engine
OpenGL Renderer              GLDoom
OPL Emulation                ZDoom
Overflow Error Emulation     PrBoom-Plus
Param Action Specials        MBF
Param Line Specials*         BOOM                    * Not incl. Hexen-format
Particle Engine              ZDoom
PC Speaker Emulation         Chocolate Doom
Polygon-Based Models         ????
Polyobjects (Raven)          ZDoom
Polyobjects (Independent)    The Eternity Engine
Portals (Non-anchored)       ZDoom
Player Skins                 Doom Legacy
Reference-Counted Thinkers   BOOM
Runtime WAD Loading          SMMU
Seg Extension via BSP        ZDoom
Seg Limit Doubling           ZDoom
Sound Sequences              ZDoom*                  * Raven-derived implem.
Slime Trail Removal          MBF
Sloped Planes                ZDoom
Strife Playable              Vavoom
TAS Demo Recording           TASDoom
TCP/IP Netcode               Doom Legacy
Texture/Flat Interchange     ZDoom
Texture Warping              SMMU, ZDoom             * Exact tie
Translucency                 DosDoom?
UDMF Support*                ZDoom                   * Designed by committee
View Pitch                   DosDoom
Voxels                       ZDoom
ZIP Archive Support          ZDoom