Below is the first of many tutorials that will show you how to create various effects using FluidNoise, and how to better use features that FluidNoise offers. Please excuse the Kiwi accent.
This screencast will show you the basics of FluidNoise, as well as how to create a terrain texture and height map, ready to import into a 3D modeling application or game engine.
For a complete list of shareware for Mac OS X developed by the Fluidmac developer, please visit Shareware Mac