Zombie Panic! Source is a standalone cooperative, survival-horror, first-person-shooter! Set in the middle of a zombie apocalypse, players start as a small group of survivors attempting to stay alive. Each map will have its own objectives to complete and win the round or survive by a period of time.
ZPO_Cabin - By SlimZ
I reconigse this one from NmriH :D
This one from NMRIH ! xD
This is in fact "Cabin Fever" a map that was being developed originally for NMRiH but is now being developed for Zombie Panic: Source by the very talented SlimZ