Parallel Secure Shell (pssh) is an ssh wrapper that makes it easy to execute commands on multiple remote systems in parallel. pssh accepts lists of host names, system attributes and exclusions.
The VSC is a PHP/MySQL/Apache Interface for Nessus 2.x. It allows users to hierarchically manage hosts, scanning policies, and request automated immediate, future/reccuring scans of a host or group of hosts, view scan reports and generate metrics.