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LimeSurvey is a survey software to create online surveys. Features open/closed surveys, branching, participant administration, quotas, WYSIWYG HTML editor, email invitations & reminders, assessments, basic statistics and more.
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.
Kaph provides a portable (written in Java) method by which to display and guide users through multiple-subject research surveys. Configuration is handled via XML files. Support for a wide range of types of questions is provided.