Information Note: The custom theaters listed below link to their respective Steam Workshop page. They are primarily listed here for the use by other server administrators, as you usually do not need to be subscribed anything to just play on servers enabled with them. Only cases in which you might need to manually subscribe to the following theaters is when running Linux or Mac OS.
Insurgency

The Armory: Expanded
35 Angry Bots Version

Description: All stock weapons unlocked to all players, along with plenty of new weapons, attachments and weapon upgrade perks.

Steam Workshop
Insurgency

The Armory: Expanded - WWII Weapons
35 Angry Bots Version

Description: All weapons from Day of Infamy ported straight over into Insurgency, including all the weapon upgrades.

Steam Workshop