Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Bizness Apps - Create your own app or become a reseller and build apps for others

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

GoodBarber - GoodBarber is a mobile app creation platform.

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.