Nice Bashing is a framework for distributed configuration of your bash environment. There are many libraries with functions which one can enable, and a rsync-based system of replicating your settings to all the hosts you connect to.
N-stage worm propagated via SSH. It executes commands in a given list of hosts and copies files to them with rsync. The paths for its propagation to the cluster are configurable. It offers a scalable/reliable transport API thanks to its adaptive algorithm