Karabiner Elements, Key Remapper, KeyTweak, Microsoft keyboard layout creator, Ukelele, keyboardlayouteditor, Input Remapper, Key Mapper, Simple Disable Key, Kinto, KeyExtender, MapKeyboard, Key Manager, X Keyboard Extension (XKB), Keyboard Layout Editor, HotKeyBind, xcape, xmodmap, KbdEdit, DoubleCommand, Key Remapper 4dots, Stick Shift, Physcape are some alternatives to SharpKeys.