Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Sports Scores - Sports Scores is a mobile application that lets you keep a close eye on all the news related to your favorite teams.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Teamer - Online & mobile-ready sports team management application
Facebook Local - Discover places to go and events happening near you
SportsTables League Manager - SportsTables League Manager is a mobile application that you can use to manage league and tournament tables for all kinds of sports.