Ayam is a free 3D modelling environment for the RenderMan interface.
LIMeTool (pronounced like the fruit), is intended to be a simple and easy interface for managing accounts on an integrated Sendmail/LDAP/Cyrus IMAP installation. It's written in PHP and is realitively easy to configure and expand.
Musaico is a web shell. It is designed to help web application developers glue together existing web applications into custom web environments.