Simple Poll - The easiest way to create polls in Slack
Tweet Reminder - Never miss the results of a poll
Curious Polls - Answer a question once a day for the chance to win £100/$100
Galarm - Social alarm clock and reminders
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.