M2 Browning / MG81Z / MG42 / MG15 / Vickers .303 / PaK 38 / M1 Mortar / Granatwerfer 34 / PM-41 / Ordnance 3" Mortar / ZiS-2 / M2A1 / M5 / ZPU-4 / Ordnance QF 6 pounder / Flak 38 / LeFH18 / Breda 35 models and sounds from the famous Battlefield 2 mod Forgotten Hope 2 ( http://forgottenhope.warumdarum.de ).
M240B / FN Mag / Artemis 30 / M60 / ZPU-4 (1949) models ported by Kali.
Nebelwerfer / MG 34 / M1919 / Bren LMG / Bar M1918 models from Day of Infamy.
GAU-19 / MG3 from Insurgency: Sandstorm.
RPK from Insurgency (standalone).
PaK 43 from Resistance And Liberation.
M777 howitzer from Battlefield 2
PaK 40 / Flakvierling 38 / Bofors L/60 models ported by damik.
Flak 36 / Flak 37 models from WT.
ZiS-3 by Aleksandr_74Rus ( https://steamcommunity.com/sharedfiles/filedetails/?id=732459570 ).
M61 Vulcan / M134 model from http://www.cadnav.com
ZSU-23-2 from some Russian website.
Kord model found here :  https://steamcommunity.com/sharedfiles/filedetails/?id=271285263
2A65 Howitzer model found here : https://steamcommunity.com/sharedfiles/filedetails/?id=1406193807
Phalanx CIWS from SolCommand.