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1.
The most incredible world creation tool ever invented. Vue and Bryce just do NOT compare.
look at deviantart
by Og, The King Of Basan December 30, 2004
 
2.
Terragen is a powerful landscape generating program, downloadable at http://planetside.co.uk/

Majority of 3D landscapes nowadays are made using this program. However, it's not so easy.
"Terragen™ is capable of photorealistic results for professional landscape visualisation, special effects, art and recreation."
by _ronstyle October 28, 2006