The voxel landscape from Heartquake - No explaination of the effect, non-recompileable. The code is largely dependant on code libraries that the coders have developed and is thus somewhat difficult to follow.
A Pmode kernel program with some extra libraries. Has a sound library and many other extras to make up for the fact that it's rather new and things such as midas, GUSPlay, or whatnot won't work with it. It's picky about assembling (tasm32+wlink only). No real documentation to help you get started.
VGA library by Lin Ke-Fong. Very good tweaked vga library. It automaticaly detects the vga card to offer as much functionality as possible instead of using the standard vga settings only like most libraries do.
Replacements for standard C Library functions. Uses pmode/w. It replaces most standard C library functions, presumeably so that you don't have to link in the stdlibraries keeping an executable size down. Has some extras.