Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X. In addition to simple key remapping, it has special remapping modes like Emacs-mode, SandS-mode (Space and Shift).
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Superkey AlternativesOnly apps categorised as Key Mapping Tools
The best Key Mapping alternative to Superkey is Karabiner Elements, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 25 alternatives to Superkey, but unfortunately only one of them is a Key Mapping Tool.
Alternatives list
85 Karabiner Elements alternatives
