Simple Poll - The easiest way to create polls in Slack
SlideLizard - Powerpoint plug-in for live audience interaction
Twitter Polls - Polls embedded in tweets
Pingo - Optimize images for the web quickly 🖼️⚡
Polls for WhatsApp - Create & share quick polls in your WhatsApp groups
Imakiku - Imakiku is an audience response system for real-time voting, posting comments, and surveying.