** Summary ** [http://coreemu.github.io/core/%|%Common Open Research Emulator (CORE)] is an open-source tool for emulating networks on one or more machines. It was once hosted by the Naval Research Laboratory and developed by [COMPANY: Boeing Commercial Airplanes%|%Boeing Research and Technology]. One of the [GUI]s (now deprecated in favour of a GUI in Python which is in BETA) is written in [Tk]. 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. code repository at [https://github.com/coreemu/core] ** Literature ** [http://202.194.20.8/proc/MILCOM08/Milcom08/pdfs/221.pdf%|%Core: A Real-Time Network Simulator]: Jeff Ahrenholz, Claudiu Danilov, Thomas R. Henderson, Jae H. Kim, Boeing Phantom Works, presented at MILCOM, 2008 <> Networking | Application | Tk | Open Source