Simple Poll - The easiest way to create polls in Slack
Poll the People - Poll the People is a leader in pre-live A/B testing.
Twitter Polls - Polls embedded in tweets
CubeGO - Scale your qualitative user testing, quickly and easily.
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.