Tesserae is a Raster image tiling application.
I initially needed the ability to split and join images for animated game sprites for a uni assignment.
Every solution I found was either a commercial product which only did one of the two operations I needed, or the alpa versions of free software did what I wanted but didn't give many options for customisation.
Tesserae is my solution to the dilemma.
If you need a simple to use, fully featured and free alternative on a Win32 based PCto split and join images, the look no further.
(Note: I will be embarking on a binary cross platform version in future using the Qt toolkit)