Credits taken from Overhaul pack, still looking for some of the others I used.  More credits coming when I release the full 850+meg pack that also improves textures, sounds and music. 

Abyss 25
Afterburner
Ambient.Impact
Besli
Bullet_Head
chrisART
COL.Grimm
Crowbar/`
Darkelfa
Darkstorn
deathray393
Denys Zhatov
Der Graue Fuchs
DiamonD
Dijesse
DONETODEATH
Editor321
End Of Days
Fat_Al
Gaming Lord
Geno
Georg.Destroy
GHOUL [BB]
Gman
Griph Weathers
GtC Fragg
Gua
Harabec Weathers
HashiriyaGDB
H4wK
Hayri Yurdakul
Hellspike
Homunculus
jAbutin
Kimono
LAca
Liquidator
Marphy Black
Minuit
Mr_NoobzKey
!NC! Furious
NiM
Norman Normandry
One Eyed Newt
Pyroclasm
Quad
Red Slug
Renard
Romka
Sabre
Schmung
Sean
Shannon Caldwell
SkyNinja
Snark
Sproily
S7ok3
Supernaut
Sureshot
SysOp
THETUB
Teh Strelok
Thanez
TheLama
Toadie
Tony_Freeman
Tundra_cool
Twinke Masta
vectorwx398
Vunsunta
Vyacheslav Dzhura
Wannabe
Water-Phoenix
Werewolf
Wonrz
Worldcraft Dude
-X-
Yamantaka

Also included additional HEV textures for v_-models by:
Millenia
RavenGT
STONE
Taehl

But it's not a full list of all possible autors, because in this package was partially used content from many Half-Life mods and projects, especially:
Opposing Force Redux
Super Definition Azure Sheep
DiamonD model packs (different versions)
Arrange Mod: Rebirth
Half-Life: Decay (PC version)
Half-Life: Weapon Edition
Half-Life: Before
Liquidator's Sven Coop Upgrade Model Pack
Sven Coop
Cleaner's Adventures
Black Ops Redux
Heart of Evil: Napalm Edition
Half-Life: Gold Singleplayer