CircuitLogix - CircuitLogix electronics lab simulation provides fast, powerful schematic design and simulation in one complete program.
Cisco Packet Tracer - Download Cisco Packet Tracer, an innovative network simulation and visualization tool used by Cisco Networking Academy students and instructors.
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.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
Multisim - Multisim is industry standard SPICE simulation and circuit design software for analog, digital, and power electronics in education and research.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming