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, Linux with XFree, SunOS,
ConvexOS and many others.

ygl is available via anonymous FTP from ftp.thp.Uni-Duisburg.DE
]134.91.141.1], directory /pub/source/X11/Ygl.tar.gz.