Opengl Math Cheatsheet
http://www.opengl-tutorial.org/miscellaneous/math-cheatsheet/

Visualization of Math Physics
http://www.falstad.com/mathphysics.html

A very good tutorial about linear algebra, it visualises the concepts!

Matrix (GLSL)
http://www.opengl-tutorial.org/beginners-tutorials/tutorial-3-matrices/

 

https://www.marmoset.co/posts/pbr-texture-conversion/

HLSL

Cg

GLSL

Mapping GLSL & HLSL

GPU Gem
Book
CD

GPU Gem 2
Book
CD

GPU Gem 3
Book
CD