I am looking for an automation tool, that I can use to automate the testing of a desktop 3d design application.
closed as not constructive by bytebuster, dzieciou, Dan Snell, Suchit Parikh, corsiKa♦ Mar 10 at 19:06
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Without knowing anything about your requirements other than "desktop 3d design", it's pretty hard to give a reasonable answer.
We use WinTask for much of our automation. It's possible that you could use it for your application, too.
Here are some trial versions of commercial functional test automation tools that may meet your needs: http://www.allthingsquality.com/2010/04/trial-versions-of-commercial-test.html