CSPortable, which stands for Counter Strike Portable, is a Conter Strike fangame based upon a ported Quake 1 engine.

Release notes:

Version 0.74

Added new explosion
Added crouch
Added 2 zoom levels
Bots are slower
Added Map Changing in multiplayer mode

New Weapons:

Added P90

New Maps made by SoTe

cs_backalley
de_mini_skyturret
de_rockslide by Bumuckl
de_train
fy_buzzkill2008_s
fy_chaos_elig
gg_mini_simpsons
mini_inferno
pubmasters_mini_dust
cs_siege

http://forums.qj.net/showthread.php?t=136763