Led Shader
View Frustum Culling
GLSL Tutorial
Maths Tutorial
Billboarding Tutorial
Picking Tutorial
Terrain Tutorial
Display Lists Tutorial
GLUT Tutorial

Terrain Generator 1.2.5
The terrain generator is a tool which can be used to generate height maps. The height maps can be saved to a file. Several terrain generation algorithms are provided. Smoothing with a matrix Filter is also possible. A graphical interface was built using the GLUI API. Source code is available for both Linux and Win32.

Dynamic Particle System API
A very cool API to build your own Particle Systems. This is a very powerful API, very clean and very ease to use. Comes complete with source code, examples and an excellent documentation (in Portuguese). Work was done by Jose Fereira, Pedro Ferreira and Rui Guerra. Let them know what you think.