ooo-app is a simple framework for social webapps written in Java. In conjunction with a bunch of other OOO libraries, it provides user management and a few other basic services.
It's probably not wildly useful for anyone outside OOO, but it's easier to make it public so that it can be built on our public continuous build server and included Heroku deploments.
ooo-app is released under the New BSD License. The most recent version of the library is available at http://github.com/threerings/ooo-app
Questions, comments, and other communications should be directed to the Three Rings Libraries Google Group.