Greenhouse

Greenhouse is a web application built for the Spring community that has two primary goals:

Serve as a open-source, public-facing reference and driver for Spring technology, including Spring MVC, Security, Integration, and the new Spring Social and Mobile projects.
Help foster and support our passionate application developer community through the development of useful community services.

An OAuth-based "App Framework" that allows Developers to develop new client apps for which users may establish Account->App connections.
An OAuth-based "Service Provider Framework" that allows new ServiceProviders to be installed for which users may establish Account->ServiceProvider connections.
The ability to connect your local Greenhouse Account to Twitter, Facebook, LinkedIn, and TripIt ServiceProviders.
Member Sign Up, Sign In, and Reset Password Modules.
A Member Invite Module allowing you to invite your Facebook friends and email contacts.
A Member Badge (Award) System that rewards members for community participation.

A native Greenhouse for iPhone Client (also available in the Apple app store).
A native Greenhouse for Android Client (also available in the Android marketplace).
A mobile web version of the app that can be used across multiple smartphone platforms.

A Group Event Management Module that powered SpringOne2gx Chicago; and in the future may power Spring events world-wide.
Numerous Spring Framework contributions in the areas of DI (Environment-specific Beans and Profiles), Security (Password Encoding and Data Encryption), Data (S3 File Storage and RDMS Migrations), Web (Email Templating, Flash Map, and Comet).
An agile Continuous Deployment CI Process.