DR4 is compilation of various resources and assets for GZDoom engine.

Credits:

GZDoom engine by Randy Heit (aka Marisa “Randi” Heit) and Graf Zahl (Christoph Oelckers). Full credits: Zdoom.org

Textures:

Github.com (Official page for DHTP): https://github.com/KuriKai/DHTP
https://www.moddb.com/downloads/doubledhtp
https://www.moddb.com/mods/wardust-hq-addons-for-doom-games
https://zandronum.com/forum/viewtopic.php?t=6132

Credits for textures: Chilvence, KuriKai, freelanzer (Jacob Ostergaard / freelanzer@gmail.com), reinchard, Tea Monster, Jive, Cpt Howdy, Fredrik Johansson, Dorian, gray, Zimond, harryboam, esselfortium, DaniJ, Envid, Tabun, MR_Rocket (Ron Goode), flaviofak, John Doe, Doomenator, wardust

Some textures: grnlite1.png, planet1.png, sky1.png (for Doom 1st episode and TNT.wad) and few other made by hoover1979: https://www.moddb.com/members/hoover1979

The modpack uses these modifed mods/resources, here are the links to their original sources:

Bolognese by Sergeant_Mark_IV: https://www.moddb.com/mods/brutal-doom/downloads/bolognese-gore-mod-v20
JDUI by teppo.lahtinen, chilvence, freelanzer, AllNatural, Mr.Rocket, Nevander, zedas: https://forum.zdoom.org/viewtopic.php?f=19&t=49119
Liquid textures by ProjectRemap: https://www.moddb.com/games/doom-ii/addons/doom-liquid-texture-pack
Tilt++ by Nash: https://forum.zdoom.org/viewtopic.php?f=43&t=55413
Footsteps: https://forum.zdoom.org/viewtopic.php?f=46&t=32622
Graphic effects (explosions, sparks, smokes etc.) from Brutal Doom by Sergeant_Mark_IV: https://www.moddb.com/mods/brutal-doom
DoomVisor HUD by saegiru: https://www.moddb.com/mods/brutal-doom/addons/doomvisor-hud-for-pa1nki113r-v51
3D models of items by aivar242, Sitters: https://www.doomworld.com/forum/topic/94067-3d-models-for-gzdoom/
3D Models of monsters/weapons/decorations by DaniJ, Sitters, ID Software, Recurracy, Tabun, -=Dark-Assassin=-, Cheb, chilvence, Tea Monster: https://slackbuilds.org/repository/14.0/games/ds-models/
3D model of Rocket Launcher taken from Vavoom 3D pack (made by by Edmundo Bordeu) : http://www.vavoom-engine.com/download.php
Universal Gibs by Lud (this pack uses my modified version with 3D gibs): https://forum.zdoom.org/viewtopic.php?t=59260
Texture lights script by Marisa Kirisame: https://forum.zdoom.org/viewtopic.php?f=46&t=64481

Shaders:

Motion Blur by Pixel Eater: https://forum.zdoom.org/viewtopic.php?f=103&t=62772
Doom Parallax: https://forum.zdoom.org/viewtopic.php?f=103&t=62104
ScreeM by Pixel Eater: https://forum.zdoom.org/viewtopic.php?f=103&t=58270
World Gamma/Bloom Boost by Pixel Eater: https://forum.zdoom.org/viewtopic.php?f=103&t=59289
Some PBR materials by Arl: https://www.doomworld.com/forum/topic/100298-pbr-for-original-doom-textures/