Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
spacedesk - spacedesk expands the Windows desktop computer screen to other computers over the local area...
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
iDisplay - iDisplay is an app that turns a mobile device into a secondary desktop monitor. The app currently supports iOS, Android, Windows and MacOS, and it lets users connect a desktop computer to a mobile device over WiFi. Read more about iDisplay.