Simple Poll - The easiest way to create polls in Slack
Outgrow - Enabling marketers boost conversion with interactive, beautiful & viral quizzes/calculators.
iPoll.app - Create instant polls and forms with in slack!
doopoll - Create live, instant, editable polls effortlessly
1World Online - 1World's Platform consists of applications like polls, quizzes, surveys, and debates to boost engagement and revenue opportunities.
Twitter Polls - Polls embedded in tweets