Curious Polls - Answer a question once a day for the chance to win £100/$100
Simple Poll - The easiest way to create polls in Slack
minipoll - Create simple shareable polls in seconds
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.
Twitter Polls - Polls embedded in tweets
Urbanpinion - Citizens engagement platform that lets you create a landing page with an interactive map in just a few steps, launch a survey and collect citizens' ideas and votes - and make the right decisions for the city development.