Dir Name (dim)  Author(s)	   Desc (Gems vol.V, page 403)
--------------------------------------------------------------
libgm     3+	Scheepers & May	  "The compleat C++ graphics library"
mactbox   3+	C. Schlick	  "Elegant macros are gentle on the eyes"
vec-h     N+	D. Hatch	  "C/C++ macros to go in any dimension"
GG4D      4+    S. Hill		  "The 4D tour de force (includes projections)"
