cf-builder
The cf-builder is what's known as the collagen/faulting (global) tool in the toolbox. cf-builder performs a global collagen/faulting process that creates a sort of ridged texture of valleys and peaks. It's mostly used to provide a bit of texture to the map after most of the rest of the work has been done, but before roads and building-foundations are placed.
Properties:
num-iterations The number of passes that the tool makes. ridge-height The amount of height added by the collagen faulting process each pass. ridge-width The feather width of the tool (how wide the lines are when they're drawn.) Below is an example of it's output.