The Project is hosted on Google Code see here.
The Sources for different components are kept in separate repositories, see below.
The latest amiServer is available here:
hg clone https://amiserver.openami.googlecode.com/hg/ openami-amiserver
Anything related to the avrBridge is available here:
hg clone https://avrbridge.openami.googlecode.com/hg/ openami-avrbridge
Additionally, Schematics and Boardlayout for the avrBridge are available in .zip format here.