I repeat, external tools are not needed!
Polls within Nabble were first announced in July 2012.
Things have changed again since that announcement. They have been fully integrated into the standard product and the additional option appears to users in all groups that have the Create_poll permission turned on. In the image below I have ringed the option in red.
As ever, it's worth adding a second user for yourself so you can test exactly how it works as an ordinary user, as Administrators see more than a ordinary user will.
As seen below, administrators always have the permission. It cannot be granted to those in the "Anyone" group.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.