HEROPA - Heropa provides you with a fast, easy and secure method to deliver software demos to customers, software training to customers.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
CloudShare - ClousShare provides a cloud-computing platform for developing and testing IT applications, software and systems.
ns-3 - a discrete-event network simulator for internet systems
Strigo - Virtual IT Labs
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.