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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.
Rydia is a web-based, AJAX frontend to the JSurveyLib survey engine. It provides an easy way to configure surveys / questionnaires and display them on a website. Rydia will work with any web framework because it integrates like an AJAX widget.
Socrates is a Java based questionnaire/survey engine, that enables fast delivery of questionnaires, both for the web and for other media like PDF. Socrates is currently an API only, based on the concepts of XForms, and includes all XForms features.