Blender  
Free program
Create 3D animations

Tutorial for 3D Crystals by Brian Zimmer

Clear Ink's Palette Man  
Create harmonious color schemes.

Color Cop  
Free program for collecting colors from anywhere on your screen

Color Schemer  
Free Trial version and online version
Program for helping create harmonious color schemes.

DC Special 2.0 Plugin Filters   
Collection of free filters
Very useful and fun filters

Digarts Software   
Jungle 2D  and  Jungle 3D
Makes realistic trees, plants and foliage

Button Maker Duo   
Free Plugins
Makes round and square buttons

Corel Products   
KPT 5 &  KPT 6

KPT 6 Scene Builder Tutorial by BJ.

Painter 6

Painter Tutorials by Jinny Brown

Bryce 4

Cybia : Creative Resource Studio 
7 Free Plugin Filter Collections
Alpha, Color, Edge, Screen, Emboss, Swap, Blaster

Dot Color  
Free program for collecting colors from anywhere on your screen

DragonFly  
Free Filters
Sinedots, Sinedots II, Shader Effect, Retrodots Effect, Icon & Cursor Format Plugin

Sinedots Addicts-more tutorials