Notepad3 - Notepad3 is a fast and light-weight Scintilla-based text editor with syntax highlighting.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
TED Notepad - TED Notepad is a portable text editor software that deals with a large variety of text processing tools, supplemental text clipboards, high accessibility through hotkeys, and a customizable number of settings and options.
ns-3 - a discrete-event network simulator for internet systems
Notepad++ - A free source code editor which supports several programming languages running under the MS Windows environment.
NetSim - NetSim software was created to simulate various Cisco systems. Cisco software is known around the world as being one of the best network, routing and switch systems for businesses and private use. Read more about NetSim.