KDE Connect - Integrate Android with the KDE Desktop
Remote Mouse - Turn your smartphone into a wireless touchpad and keyboard now!
VLC Mobile Remote - This VLC Remote app for iPhone, Android & iPad lets you control VLC Player on PC or Mac. Also browse, play computer files & YouTube, Netflix, Prime videos.
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...
VLC for Apple TV - Stream all your locally stored videos to your Apple TV
Macro Deck - Use smartphone as macropad for pc