HID Remapper is a useful open-source programmable adapter for USB input devices, with a recent release adding support for Valve's new Steam Controller.
HID Remapper now fully supports the Steam Controller, including gyro, trackpads, and advanced inputs on more devices.
If you don't like the way your keyboard is laid out, a keyboard remapper can change it. There are only a few for Mac OS X, and the lack of development on many of your options makes your choice pretty ...
If you wish your keyboard's keys were laid out just a tad bit differently, you can change it around with a keyboard remapper. Windows users have a few to choose from, but the easiest to use is ...