A Questionnaire is a Research Instrument consisting of a series of Questions, Selections, other means of gathering Input for Purpose of gathering Information from responders.
A Questionnaire application should have the following Features:
Email invitation
CSV export functionality
A number of Django Questionnaire Applications are available:
django-questionnaire [https://github.com/UoK-Psychology/django-questionnaire]
Seantis-Questionnaire
[http://questionnaire.corporatism.org/]
Django Questionnaire app [http://djangoquest.aperte-it.com/]
django-survey [http://code.google.com/p/django-survey/; https://github.com/flynnguy/django-survey]
Case Study Questionnaire [[Questionnaire](https://code.djangoproject.com/wiki/CaseStudyhttps://code.djangoproject.com/wiki/CaseStudyQuestionnaire]
Questionnaire system build on top of django-cms [https://www.djangopackages.com/packages/p/django-cms-saq/; https://github.com/Maplecroft/django-cms-saq]
Django-crowdsourcing [https://pypi.python.org/pypi/django-crowdsourcing]
As no one of them fulfills the requirements that Denigma faces, Denigma features its own highly flexible Questionnaire Application which can be further extended and shall be pluggable survey tool.