Simple Poll - The easiest way to create polls in Slack
Twitter Polls - Polls embedded in tweets
iPoll.app - Create instant polls and forms with in slack!
doopoll - Create live, instant, editable polls effortlessly
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups
Polls for iMessage - Group Decisions Made Easy. Create polls, vote, and view the results directly in iMessage. The easiest way to make any group decision.