Sapphire Innovations  
Free demos available
Sapphire Paper Textures
1000 paper textures for Paint Shop Pro  5 and  6.
Sapphire Tubed Volume 1 - Tubes
160 single royalty-free tubes for Paint Shop Pro 5 and  6.
Sapphire Tubed Vol. 2
185 single royalty-free tubes for Paint Shop Pro, version 6 only.
Tubes Magic 1
Collection of 1000+ tubes for PSP 5-7. Also comes with a large set of additional brushes. 

Swish  
Free Trial Version
Easy Tool for creating Flash Animations

Teph's Tricks   
Free filters

Terragen   
This is a program to generate landscapes. Wonderful program. 
At this point in time Terragen is free.

Terragen Tutorial by Carol Brooksbank

Serif PhotoPlus 6  
Free program (limited time offer)
Digital imaging and animation, includes 'smart' shapes.

Strata Tools  
Strata 3D pro
Create  3D models, images, animations and live web content
Strata 3D
Free version

The Font Thing  
Freeware Program for managing Fonts

Toadies  
Free filters