Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Meetup for iOS and Android - Discover groups that are all about the things you love
Zoho Backstage - Plan, run, and analyze your event— all from one place
Conode - A simple editor to organize meetings
Gathered - Make and share connections at events and meetups
List and Invite - Create an event, make a wishlist and share it with guests