Kete 1.1 has been released. Kete is a Ruby on Rails application. Source code can be obtained from the Downloads page.
Here'e an excerpt from the 9/1/08 ITSIG announcement:
Kete combines features from Knowledge and Content Management Systems as well as collaboration tools such as wikis, blogs, tags, and online forums to make it easy to add and relate content on a Kete site.
A more complete description can be found on Katipo’s Web site (Katipo provides fee-based support for Kete).
The Kete 1.1 Features and Bug Fixes page lists new features in this version.