Rex is a small and lightweight framework I came across visiting a website (I forgot which one it was). At first I wasn’t to sure what to make up out of it, but while browsing trough the documentation I got excited and saw the possibilities of using it. Within minutes I got it up and running (thanks to their handy-dandy YUM repository (I use CentOS)), and the cool thing is, it’s written in Perl so in theory you could run it on any platform (Windows included). The big advantage to Rex is that you can use your ssh keys (or user-pass combo) from your “master” server where you have Rex installed and connect using ssh so you don’t have to install daemons on your target servers!