List of custom maps (Killing Floor)
Killing Floor doesn't just end with the stock maps. The Killing Floor SDK (which is available on Steam as a tool) lets anybody create a map, either from a blank canvas or just touching up an original.
Here is a list of custom Killing Floor maps for you to download. (Please note that this is not a complete list, and will never be actually 'completed', there are 1,000+ KF maps somewhere out there)
Final Map Releases
Author: SoulCrusher 
Lockdown is a map that takes place deep in the Amazon jungle where Horizon has a secret bio-weapons testing facility. When your squad shows up, you realize that there has been an outbreak of specimens and that your job is to clean up the mess. A local Response team got to the location before you and they had the floor swept with them. Air Support surrounds the facility, mopping up any escaping/escaped specimens.
The level also has a "Lockdown" mode (hence the map name) that goes into effect at certain times, the first time at 14 mins into the game. When lockdown activates, you'll notice red flashing lights where doors are closing. Once closed, zombies won't attack the doors unless you weld them. This gives you a chance to catch your breath for less than 2 minutes and take free shots at zombies out the windows. Once the doors start opening, it makes killing zombies outside your doors easy works as the doors open slowly. The map doesn't go into lockdown very often, evening the playing filed for the zombies.
Author: =[PMC]= breakfast 
A remake of the classic Call of Duty 4 map "shipment". Gameplay is hard because of the tight corners, but makes for very fun gameplay.
Author: Hicks-D 
S.T.A.L.K.E.R. style map, great for large groups of players.