Put here because steam wouldn't let me put everything on the main page.

Credits:
An average Beanmann (Me): Creator of this addon, some texture edits, retiming events on certain animations.
Valve: Any and all Half-Life, Counter-Strike, Team Fortress, or Left 4 Dead content used in this addon.
DrVrej: Creator of VJ Base, which this addon uses.
Darkborn: Current owner of Lethal Necrotics Reanimated. Any and all LNR assets used in this, including modified and/or adapted code from LNR. NMRIH walking animations extracted from GOTD. Allowing ToTU to be independant from LNR: HL2 by letting certain assets be implemented into ToTU.
Warkin: Teaching me the basics of crowbar, providing episodic zombie models, dodging animations, squaller texture edits, and also support during the rework process.
DoofusCockslap: Fixed stalker idle animations, help with getting l4d animations to be non-distorted.
Lacrinimo: Various improvement ideas.
Null: Morti/Cepheus and Deimos symbol designer.
Indigo/A Pink Hedgehog: Redrawing the Morti/Cepheus and Deimos symbols.
Overkill Software: Payday 2 Bulldozer model, Bulldozer footstep sounds, Skulldozer skull design, Cloaker WULULU sound.
MARK2580: Payday 2 Bulldozer port.
M9k Specialties Pack: Detonator bomb model.
Infinity Ward: Modern Warfare 2 (2009) Juggernaut and Ghillie models.
NMRIH Team: No More Room In Hell zombie walking animations.
Crowbar Collective: Black Mesa zombie models, original Grunt Corpsman helmet texture.
Simkas: Airman model.
Underhell Team: Underhell health spray model.
Dnzl_gg: TLOU Hazmat Military gmod port.
Naughty Dog: Original TLOU Hazmat Military model and textures.
whynotll83: HLA Zombie replacement rig.
Black Tea Za: Casual Citizen textures.
jQueary: HLA Zombie port.
Vuthakral: L4D-like weapon gesture attack animations. (not in yet)
Techland: Any and all Dying Light sounds..
We Create Stuff: Nightmare House 2 Security Zombie Sounds, NH2 Surgeon Zombie model.
CAPCOM Co., Ltd.: Resident Evil 7 Molded and Fat Molded sounds, Resident Evil 1 Remake Crimson Head sounds.
Joonas Rikkonen/Regalis: Old SCP Containment Breach 049-2 Model, SCP 106 sounds used for Deimos mutating.
Frictional Games: Any and all SOMA, Amnesia: The Dark Decent, and Amnesia: A Machine for Pigs materials/content.
Predator CZ: Amnesia Servant Grunt and Servant Brute port.
id Software: Doom 2016 Possessed sounds.
Visceral Games: Dead Space 2 Puker sounds, Original Dead Space 3 Feeder model.
Half-Dead: Their version of the DS3 Feeder.
Tripwire Interactive: Killing Floor 1 Gorefast sounds.
New World Interactive: Any and all Day of Infamy sounds.
EvilBanana 202: Ripping the DL2 Howler and HLA Jeff sounds.
Ghost Ship Games: Sounds used for Squaller's Iron Will, taken from Deep Rock Galactic.
These involve easter eggs, read at own risk:

Sony Pictures Television: Breaking Bad sound clips.
Viacom: Any and all Spongebob sound clips.
Croteam: Serious Sam Kamikaze sounds.
David Szymanski: Ghost reveal easter egg sound effect.
The Walt Disney Company/Seth MacFarlane: Any and all Family Guy sound clips.

And anywhere else where credit is due.

If I forgot to add anyone/anything to this please let me know.