Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
Remote Mouse - Turn your smartphone into a wireless touchpad and keyboard now!
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
Monect - Make the best use of sensors on smart device to control PC, simulate steering wheel, game-pad...
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
KDE Connect - Integrate Android with the KDE Desktop