javastim
An e-stim signal generator in java
...Will allow 1-4 channels (2-8 electrodes). Output the signal via a soundcard to an amplifier that can output e-stim compliant signals (100+V, current limited to about 100mA, high impedance, short circuit proof). Care to have a potential free output for every electrode (use separating NF transformers). Author claims no responsibility for physical damage from misuse or routing the signal through unsuitable circuitry.