Does anyone know of any transition creators?

Hi everyone

I am trying to find any freeware/shareware transition creators (mainly to be used for creating terrain transition textures)

I managed to find a few myself with links that no longer work, does anyone know of any I may have missed?

This one was the first I found while searching

ImageTrans
http://www.freewebs.com/jake_blues/imagetrans.htm

I do remember zak-interactive.dk had one a few years ago now but could not find any mention of it anywhere.

Failing that does anyone know of any good masking techniques or able to provide links for reference so that I could create my own transition creator.

Thanks in advance
Brendan