Omake = bonus or extra
Full MegaTokyo Panic! - spoof of Full Metal Panic!
Clan'd - spoof of Clannad
War3z - slang for pirated software downloaded from the internet.
"Clan'd War3z" also comes close to the phrase "clan wars" for an extra pun.
Note: This omake series is rife with references to both Full Metal Panic! and Clannad, too many for me to point them all out.