Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
Wifipad - WifiPad transforms your iPhone/iPod Touch into a wireless gamepad.
Pushbullet - Pushbullet - Your devices working better together
aGamepad - aGamepad allows you to use your Android based phone as gamepad for Windows.
Unified Remote - Unified Remote is a software app available for iPhone, Android, and Windows Phone mobile operating systems. It's designed to turn your smartphone into a universal remote. Read more about Unified Remote.