Simple Poll - The easiest way to create polls in Slack

Respondent - Respondent helps you find any target audience in the world for in-person and remote research studies across all research methods including interviews, focus groups, surveys, and more. Respondent works with any research tool you already use.

Twitter Polls - Polls embedded in tweets

Startquestion - Say goodbye to boring surveys and forms.

Polls for WhatsApp - Create & share quick polls in your WhatsApp groups

Qualaroo - Qualaroo makes it easy to survey specific groups of website visitors to gain qualitative information.