Mobilizon - A free and federated tool to get our events off Facebook
eventup - Find Great Event Venues in the US
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
EventCast - EventCast is an app that helps you schedule events and easily invite participants to subscribe.
EvenTurbo - It has a solution for any size of organization, be it a small business, local user group, regional training company or a large organization.
Swift Polling - Swift Polling is a text and web polling and presentation platform.