Most likely, you aren't simply interested in creating terrain for its own sake - you need to get your terrain from World Machine into your other applications. Here's a list of workflows, both generic and specific, to help you along.
Choose your Workflow | |||
| (Generic) 3D Rendering Software | (Generic) Game Map Creation | ||
| Terragen 2 | Vue | Unreal Engine | Crytek Engine |
| Unity | |||
... and more specific workflows to come! |
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World Machine 2 is a very popular terrain generator for Crytek-derived games. The official Crymod wiki has an excellent workflow article detailing how to use World Machine with Crytek. Rather than reinventing the wheel, simply read about it there!