Classic Offensive, A Mutant Counter-Strike - YouTube
CSCO Preview image - Classic Offensive mod for Counter-Strike: Global Offensive - Mod DB
Steam Community :: Video :: Counter-Strike: Classic Offensive (CS:GO Mod) - Dust II
Classic Offensive on Twitter: ".@ZooL_Smith did a modification of @CSGO's HUD to look more like its classic counterpart. The layout of the HUD in CS:GO is ideal and doesn't really require tweaking.