http://www.indiabix.com/electronics-circuits/
http://www.falstad.com/circuit/
Download it, so you can save your circuits: http://www.falstad.com/circuit/circuit.zip
Free at a limited level: http://www.docircuits.com/
Free circuit simulators @ wikipedia:
http://en.wikipedia.org/wiki/List_of_free_electronics_circuit_simulators
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