Cisco Packet Tracer - Download Cisco Packet Tracer, an innovative network simulation and visualization tool used by Cisco Networking Academy students and instructors.
BioWin - BioWin
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
AQUASIM - In order to support environmental scientists in finding an «adequate» model of the system...
Paessler Multi Server Simulator - Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.
DWSIM - DWSIM is an open-source CAPE-OPEN compliant chemical process simulator for Windows and Linux.