Here's one but shareware
I used it in the past and it was very good...
Dr. Fatal
With HDSleep, you can control the Power Management of your IDE and EIDE harddisk drives even if your BIOS does not support it. This is not only a question of power saving, it significantly reduces the noise your computer makes.
HDSleep enables you to define suspend times common to all drives or, apply independent settings to each of them. With the small taskbar icon and its context menus, you will control the power management just with a mouse-click.
If you already have a so called Green BIOS, HDSleep still can be a valuable tool for you. You are not limited to the fixed settings in your BIOS, instead you can change the PM options anytime you want, and even spin down your drives immediately with one mouse-click.