pspice.com - an eda product and software community site for pspice user. Includes analog and mixed analog/digital circuit simulator information from OrCAD. http://www.pspice.com
Home page of free RF/microwave harmonic balance circuit simulator. It is useful for analog nonlinear circuits simulation with diode and MESFET nonlinear elements. http://users.sovamua.com/foratech/gserdyuk/hbfree