slm - Slim, Jade like template engine for node
ns-3 - a discrete-event network simulator for internet systems
SIMUL8 - Simulation is an effective system that permits you to make striking, certain choices since it gives you the confirmation to make certain you are settling on the right decision.
Mininet - Mininet is a robust and inexpensive Instant Virtual Network designed to function on standard PCs like Laptops and Desktops.
FlexSim - Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.