This article is from the Flight Simulators FAQ, by with numerous contributions by Bob Wittick rwittick@msu.edu others.
The following sites are taken from archie as of 2/17/94:
acm-4.0.tar.Z -- ftp.x.org /contrib
pdq.coe.montana.edu /pub/mirrors/X11-contrib
sunsite.unc.edu /pub/X11/contrib
theta.iis.u-tokyo.ac.jp /pub1/contrib
ftp.luth.se /pub/X11/contrib
 
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