Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
ns-3 - a discrete-event network simulator for internet systems
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
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.