Information about OpenGL implementations can be found at
http://www.sgi.com/Technology/openGL/vendors.html .

OpenGL is either bundled with the operating system or unbundled depending on
the vendor. Prominent OpenGL vendors with X products are DEC, E&S, IBM,
Metrolink, Portable Graphics, Sony, and Template Graphics.  Portable Graphics
and Metrolink both provide OpenGL implementations for Linux.

Brian Paul's Mesa is a public domain implementation of a library with an API
very similar to that of OpenGL.  Currently, Mesa works on most Unix/X systems
and MS Windows. An outdated Amiga driver is also included (but needs some
work). Other device drivers for MS DOS, Mac, etc. should be available
eventually.  Mesa can be obtained by ftp.  Information on Mesa can be found
at http://www.ssec.wisc.edu/~brianp/Mesa.html . 1.2.6 was current 5/96.

The OpenGL Utility Toolkit (GLUT) is a toolkit for making it easier to
explore OpenGL programming.  It implements a simple windowing API for
OpenGL.  GLUT was described in the Nov/Dec '94 issue of The X Journal
magazine.  Version 3.0 of the GLUT API version 2 distribution is now [6/95]
available in ftp://sgigate.sgi.com/pub/opengl/xjournal/GLUT/ .

Two OpenGL for Linux implementations are now available from either Metrolink
and Portable Graphics (an E&S company).  These are licensed, complete, and
conformant implementations.  Info at:

	http://www.metrolink.com/products/ogl.press.html
	http://www.es.com/products/PC/Linux.html

OpenGL implementations are also available for non-X platforms like
Windows NT, OS/2, and the Power Mac.

Thanks to mjk@hoot.asd.sgi.com (Mark Kilgard) [8/95].