The best System Tweaker alternative to Key Remapper is X-Mouse Button Control, which is free. If that doesn't work for you, our users have ranked more than 25 alternatives to Key Remapper, but unfortunately only two of them are System Tweakers.
X-Mouse Button Control is a Windows application to remap your mouse buttons and expand the capabilities of your mouse!
Offers tools for building custom keyboard layouts, editing existing setups, and supporting multilingual input locales. Compatible with Windows 2000 to Windows 7, including 64-bit platforms, and enables packaging for easy installation on multiple machines.
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X-Mouse is for mouse only, can't remap keys and assign them special functions