fourth generation analog and mixed signal circuit simulation package
http://www.web-ee.com/Downloads/Simulator/ICAPdemo.exe
Analog and Mixed Signal Simulation from Intusoft.
http://www.intusoft.com/
Schematic Capture & Simulation
http://www.microcode.com/
show user circuit calculation by Kirchhoff's laws, Node Voltage and Mesh Current methods.
http://www.geocities.com/ecalcsys/
Symbolic circuits analysis software to simulate AC/DC circuits using Kirchhoffs laws, Node Voltage and Mesh currents. Circuit Magic allows you to design, simulate and learn about electrical circuits.
http://www.circuit-magic.com/
a general purpose analog circuit simulation and design program. You can download a free student version and documentation of APLAC Circuit Simulation and Design Tool.
http://www.aplac.com/
analog Mixed Signal Simulator from Deutsch Research.
http://www.deutsch.com/
Mixed Signal Simulation from Analogy Inc.
http://www.analogy.com/