Scalaffinity is a library providing core functionality for any social networking Web site based on ratings and recommendations. In other words, it is a generic collective intelligence library. Examples of such sites are Anobii, Rate Your Music, and Filmaffinity. It is designed to act as an out-of-the-box model for such Web applications. Nevertheless, Scalaffinity is fully customizable, extensible, and scalable. It incorporates lessons learned while reading "Collective Intelligence in Action" by Satnam Alag.
SlimWeb aims to replace Struts or JSF in your J2EE application, but is closer to Rails or TurboGears in its heavy use of convention-over-configuration, simplicity, and power. It aims to reduce (and most of the time completely eliminate) all boilerplate code, XML configuration files, and even deployment times.