The only really free Survey plugin

I have tested lots of poll/survery plugin, some are very bad, most of the others might be good but they are not really free, you get only a few features for free but 90% of the time you will have to upgrade to the paid version to get the job done. This plugin is simple to use, easy to understand/create/edit polls (with as many questions as you like) and useful as it is for your standard poll/survey.
The only issue I’m having is an error with REST API (cURL error 28) I have already sent to support and they are investigating it, I’m confident this will be fixed because the plugin updates usually are frequent and regular.