We're developing one, but it won't be available for a little while.

EasyTestMaker (http://www.easytestmaker.com/default.aspx) is an option, though their UI feels a little old fashioned.

The quiz maker from ProProfs (http://www.proprofs.com/quiz-school/) is also pretty good.

If all these fail to meet your specs, you could always create a form in Google Docs.