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.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
slm - Slim, Jade like template engine for node
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.
FlexSim - Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.