EventBrite Online RSVP - EventBrite Online RSVP is a cost-effective event management software that provides services to help businesses organize, invite people together for an event, and sell tickets.
Twitter Polls - Polls embedded in tweets
Rsvpify Virtual Events - Rsvpify Virtual Events is an event management tool that provides you various functionalities ranging from setting up the entire event to selling the tickets online to the targeted audience.
Simple Poll - The easiest way to create polls in Slack
EventCreate Online RSVP - EventCreate Online RSVP is a tool for collecting RSVPs online.
Polls API - Scalable, efficient API to build polls, quizzes, ratings and many more