AppMockUp - Create the most compelling screenshots for your app.

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

Placeit - Generate realistic product shots in seconds

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

Smartmockups - Create stunning product mockups, easily and online.

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