Eventee - Eventee is the most beautiful and easy-to-use mobile event app for attendees.
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Facebook Local - Discover places to go and events happening near you
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets