Eltima Software has introduced Typeeto (http://mac.eltima.com/bluetooth-keyboard.html), an app that enables use of Mac as a Bluetooth keyboard for other devices.
The tool provides a real-time access to a full-scale Mac keyboard for easier interaction and typing on other devices. You can connect as many devices as you need to your Mac and switch between them in one click.
No additional applications have to be installed on your device. Just launch Typeeto and start typing away. You can copy-paste text from your Mac to the device and the other way around.
Typeeto requires Mac OS X 10.9 or later. It’s available on the Mac App Store and costs US9.99.