AnyLogic - AnyLogic has changed simulation modeling and expanded its application into complex business environments. The unmatched flexibility of multimethod modeling allows users to capture the complexity of virtually any system, at any level of detail.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
ns-3 - a discrete-event network simulator for internet systems
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
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.
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.