TO KNOW WHAT SPICE IS, CLICK wiki link HERE.

1. Please Click HERE to get an extensive tutorial on SPICE & HERE to get a brief one.

2. A good link to learn LTspice appears HERE. Download LTspice from HERE.

3.To get video tutorial of LTspice by famous Prof. J.BAKER, click HERE.

4. To download BSIM models, click "LATEST MODELS" tab on PTM website.
5. Please Click HERE to get spice model from Texas Instruments.
6. TINA-TI is also a free spice simulator.I don't like it as much as i do LTSPICE,
but you may wish to download it from HERE.