FrikQCC

FrikQCC started just before the Quake engine source release in 1999. Based on Jonathan Roy's FastQCC, FrikaC tried to "bring new features to the code to make Quake more appealing a language to high-nosed programmers that said it wasn't a 'proper language'." Early in 2000, JP Grossman released qccx, which proved to be a major turning point in FrikQCC.

It supports: goto, labels, static variables, new optimizations, compiler warnings, and many other features.