There are many versions of SPICE available today. Depending on the capabilities and interfaces, you can get student, standard and professional packages ranging in price from free to several thousands of dollars.

Many companies offer a free demo version but are typically limited to the number of component (25 or so). The first two listed are free with no component limit. SPICE files on this site should run on demo versions.
 

LTSPICE by Linear Tech
www.analog.com
Here's a great SPICE version with no component limit! It's a fully functional SPICE simulator with enhancements and models optimized for switching regulators.

QSPICE by Qorvo
www.qorvo.com
A recent entry into this field, QSPICE simulates analog and mixed signal optimized for power designs.

TOPSPICE by Penzar
www.penzar.com
You can get a great demo version called TopSpice from Penzar.

 

 NOTE!  Other simulators may also work well with some small modifications to the netlist. Many vendors will tell you how to make a netlist compatible with their version of SPICE.

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