Twitter Polls - Polls embedded in tweets
WhosDown - App where you can genuinely make friends—connecting with someone that shares a common interest
Simple Poll - The easiest way to create polls in Slack
Meetup for iOS and Android - Discover groups that are all about the things you love
Polls API - Scalable, efficient API to build polls, quizzes, ratings and many more
MEETplnr - Organize meetups in your chat groups with ease