Simple Poll - The easiest way to create polls in Slack
ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
minipoll - Create simple shareable polls in seconds
Proboards - ProBoards is a host of free forums with customer service.
doopoll - Create live, instant, editable polls effortlessly
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android