molecular dynamic: wich program?



Hi all,
I'm looking for a free program for bio-molecular dynamics simulations, capable to run under a multiprocessor system.
could you send me the web-addres where I can find out this program?
thanks for yours help. 
--
Dr. Mirco Meniconi
university of Perugia (ITALY)
 
e-mail: mirco.me %! at !% inwind.it
phone +39 75 5855114
mobile +39 328 9526589