Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Ruffle - An open source Flash player
Facebook Local - Discover places to go and events happening near you
Lightspark - The Lightspark project
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
SuperNova Player - SuperNova Player allows systems to play .SWF files in a standalone player launched from any browser.