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I have been using Simetrix on a regular basis for around 5 years now. Great program, amazing that there is a free version. Powerful enough to do quite big circuits; good schematic editor, REALLY good graphing program. I do a lot of opamp stuff - filters, amplifiers etc, and I tend to use the VCVS instead of the opamp models - makes the analysis faster, and lets you analyse much bigger circuits. I now analyse almost every circuit I design, even simple ones (amazing what you find), and I mostly don't bother to prototype them. Highly recommended.