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Exploring Spring Models
An excellent article, and a demo, by Gustavo Oliveira on Springs. The article reviews the implementation of a spring model from its simplest form to more sophisticated applications, taking the subject a step beyond the material available in most references.
Diffusion effect tutorial
This tutorial presents a simple and efficient algorithm to create a well-known effect, which can be seen in a lot of WinAMP plug-ins such as "Geiss". Check it out, it is really a nice effect.
This tutorial will teach you Cel-Shading. A very cool effect that makes images look like cartoons! By Sami "MENTAL" Hamlaoui.
Model loading for OpenGL
3DS, ASE and OBJ file loaders for OpenGL. In here you can find the source code along with some documentation about the file formats.
Real-Time Per-Pixel Point Lights and Spot Lights in OpenGL
With the breakthroughs in features and performance of modern consumer graphics cards, the quality and realism of real-time computer graphics (most notably games) has increased at an astonishing rate. The latest set of features (introduced with the nVidia GeForce series) includes hardware transform and lighting (hardware T&L) and per-pixel lighting.
Four Tricks for Fast Blurring in Software and Hardware
A very interesting article on Blurring. It explains the theory, and possible, and unusual, effects obtained in real time. Describes an uncommon usage for mipmapping.
Loading 3DS Files
Not really a tutorial, but C code. The code seems simple enough though. Note that is not a full 3DS loader, it only loads vertex and face data plus materials.