The NewMod homepage has the latest version 1.9.2 of this Quake III Arena utility that "can create a new source code project (mod) from an existing project which will compile into the mod's proper folder in your Q3A folder." This release includes a new backup command and a CompileMod utility to build your mod from anywhere on your path, and the author says it will likely be the last release "until someone decides to port the code to other OSes or make a GUI version."