During the last year, Duo core has almost completely been rewritten to provide support in the future for new IAs, a networked game, and other user interfaces. The code is now available on Launchpad, and the main development of Duo moved there:
Join us there and help us build Duo.
You still can find here packages and support for versions until 0.8.1. The code for these version remains available on the following Subversion server: