Hop - Spike makes working easier and more efficient. Saving you and your team time, sanity, and a lot of headaches.

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

Funnster - The best way to get together with your friends and family

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

Gigstarter - Gigstarter uses crowd funding to take the pain from arranging events.

Bigtent - BigTent is a web-based organization and communication portal for groups.