We are having EDSpice as a Spice tool for simulation of analog circuits.EDSpice is a module present in EDWinXP. EDWinXP uses its own simulator called mixed mode simulator which simulates Stepper motor, Microcontrollers(8051 ,AVR etc- which is programmable), Alphanumeric displays, ADCs ,DACs etc in the simulator. You can download the evaluation of the software from the website www.visionics.a.se
I heared once that H-spice is the best simulator ever in its accuracy...but that is on the expence of simulation time, that's to say it is the worst in simulation time.
All the other simulators try to trade a little bit, by decreasing the accuracy a little bit to get the results in less time using diffrent simulation algorithms.