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Terragen 2 + OnyxGarden .
Looks quite wild, which I like. The clouds on the right need a bit of softening towards their base. You can do this by changing the final density modulator in the functions area of the cloud controls.
Here's a link to the Cloud Function Tutorial. http://www.planetside.co.uk/docs/tg2/cloud_function_tutorial.pdf
Also, if you are using Terragen 2.1, there is an upgrade available. This has the new cloud features and many other improvements.