Castalia developers have released version 3.1 of Castalia, a simulator for Wireless Sensor Networks (WSN), Body Area Networks (BAN) and generally networks of low-power embedded devices. The main new feature is a tool to automatically create graphs based on output from the CastaliaResults script. It also enhances the functionality of TunableMAC and provides several bug fixes. Castalia is developed in the Networked Systems theme at NICTA (Australia) since 2007.