TouchPortal - Touch Portal is a companion app to control a PC or a Mac by using a deck of buttons to improve the workflow & productivity of game streamers, content creators and professionals.
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...
Macro Deck - Use smartphone as macropad for pc
LEA Extended Input - iOS/Android app with windows server to control functions in games via your smartphone/tablet.
Deckboard - Deckboard helps you create macros for Windows PC and launch them on your phone.
Wifipad - WifiPad transforms your iPhone/iPod Touch into a wireless gamepad.