This is a fork of Common Open Research Emulator (CORE) from http://www.nrl.navy.mil/itd/ncs/products/core  A description from the project page: "The Common Open Research Emulator (CORE) is a tool for emulating networks on one or more machines. You can connect these emulated networks to live networks. CORE consists of a GUI for drawing topologies of lightweight virtual machines, and Python modules for scripting network emulation."