Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
Pushbullet - Pushbullet - Your devices working better together
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
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.