The only program I know of is an old version of some software called Axagon Composer. It's not the greatest, but for $0.00, it's probably the best you'll get. Google it.
yaeh
The "best" program will likely depend on the PLL of your motherboard. Different overclocking tools support different PLLs. The main programs you will want to look at are:
ClockGen SetFSB CPUFSB...
Related ads:
Shopping for Computers deals?
Find Coupons and Promo Codes on Coupons by Answers.com