Smith - A microcontainer builder (by Oracle)

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

Consumers’ Checkbook - Delaware Valley Consumers' Checkbook - Your Unbiased Non-Profit Service Ratings Authority

Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

TaskRabbit - TaskRabbit connects you to safe and reliable help in your neighborhood.

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