Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Envoy - Visitor registration that's changing how guests are greeted in companies around the world.
Zoho Backstage - Plan, run, and analyze your event— all from one place
Teem - Cloud-based meeting room booking system
Meetup for iOS and Android - Discover groups that are all about the things you love
RobinPowered - Robin coordinates meeting spaces, people, and things in your office. Complete with analytics and insights that uncover usage and help optimize space.