JSurveyLib is a Java survey/questionnaire engine that is embeddable and easy to configure. It supports many question types and a powerful scripting language to add even more customization.
Totally awesome. I even needed to alter it to use tabs. And it was so easy. Any other API would have been a disaster at this, but the clean code and brilliant design made it easy. The documentation helped as well...
jsurveylib, easy to use
Good Code for implementing fast a flexible survey. Not all Capabilities are documented ( As pictures and how to load back, already made answers)