BF Survey is an advanced but simple to use extension that allows you to create online forms, surveys, and applications for your Joomla website. It's build on Akeeba's Framework On Framework, so is flexible and you can easily override all the views and CSS and customize to suit your needs. Taking advantage of powerful core Joomla features such as content version history, you can allow your users to edit existing surveys and you will be able to see exactly what they change. I encourage you to download our free trial and try it out for yourself to see if the product will suit your needs.