Prax is a pure ruby alternative to Pow!! that runs on GNU/Linux. Quick Start Provided you are on GNU/Linux (Mac OS X isn’t supported yet), and that you have Ruby and the Rack gem installed. sudo privilege is required to install the NSSwitch extension, to configure /etc/nsswitch.conf and install the iptables script: $ sudo git clone git://github.com/ysbaddaden/prax.git /opt/prax $ cd /opt/prax/ $ .