Capslock to Control will remap the capslock and the enter keys to control.
For the curious, I've installed this on Tiger (10.4.6) without issue.
Learn how MacUpdate Desktop can install apps on MacUpdate with the simple click of the icon. Plus, keep all your apps updated.
Discover New Mac Apps. Save money with MacUpdate Promo & keep your Mac software secure and up-to-date with MacUpdate Desktop.