Infinite Fill Mod by vova7865
A simple mod that add a /ifill command that does exactly the same as /fill, but can fill more than 32768 blocks!
InfiniteFluids by Joseph C. Sible
Allows fluids other than water to be infinite (i.e., turn non-source blocks next to source blocks into source blocks).
Infinity Coins by aMUSiC
Aimed mostly for server admins who want to include an actual representation of currency in their server without too much hassle.