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.
Macro Deck - Use smartphone as macropad for pc
Bitfocus Companion - Bitfocus Companion enables the reasonably priced Elgato Streamdeck to be a professional shotbox surface for an increasing amount of different presentation switchers, video playback software and broadcast equipment.
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.
MATRIC - Control PC applications via smarthone/tablet. Especially suitable for space/flightsims.
Wifipad - WifiPad transforms your iPhone/iPod Touch into a wireless gamepad.