Ygl emulates SGI's GL (Graphics Language) library under X11. It runs
fine under AIX 3.2, HP-UX 7.0/8.0/9.0, GNU/Linux with XFree, SunOS,
ConvexOS and many others.

ygl is available via anonymous FTP from ftp.thp.Uni-Duisburg.DE
[134.91.141.1], in /pub/source/X11/Ygl-x.x.tar.gz.
Information is available on the World Wide Web at the URL
http://www.thp.uni-duisburg.de/Ygl/

As of 2002-04-26, a new version (4.1) of Ygl is available.