AppMockUp - Create the most compelling screenshots for your app.
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
Placeit - Generate realistic product shots in seconds
Nabble - Nabble is a forum software that are embeddable and fully customizable with scripting language.
Smartmockups - Create stunning product mockups, easily and online.
Bigtent - BigTent is a web-based organization and communication portal for groups.