Expert System Development Tool

I am looking for an expert system development tool. I have used Flex, Exsys Corvid and Clips.
I need a tool which has a good user interface too.

I don't know any of your mentioned development tools. But here, on ni.com you will find a really good tool for developing graphically User Interfaces. Check it out and download the evealuation version. LabVIEW.
I don't know why you posted this question on the Lookout forum, but as well NI's Lookout is a great tool to develop fast and easy HMI User Interfaces. As well there NI has an evaluation version. Check it out: Lookout
Hope this helps
Roland

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