bash scripting guide

bash scripting guide!
http://tldp.org/LDP/abs/html/

C# helper

So many people sharing so much great code...
This is a blog with terrific examples, this time in C#...
http://www.csharphelper.com/howto_index.html

And an image from a compile of the howto_heighway_dragon entry below.

opengl tutorials

Some good opengl tutorials here...
http://headerphile.com/

basic image filtering

A fairly complete tutorial on image filtering...
http://lodev.org/cgtutor/filtering.html

And some other good stuff...
http://lodev.org/cgtutor/index.html

An explanation, by Bill Casselman, for drawing geometry  in Ghostscript and Postscript...

http://www.math.ubc.ca/~cass/graphics/manual/index.html#samples