Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Simple Poll - The easiest way to create polls in Slack
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
GitHub Polls - Polls for GitHub issues and readme
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
minipoll - Create simple shareable polls in seconds