Noizio - Feeling that the noise of the big city is too much for you to bear?
Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
Noizer - Ambient sounds like Noisli, but free
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
Defonic - Create a unique sound environment at home or in the office
Mocha Keyboard - Mocha Keyboard is a leading Bluetooth keyboard application for iPad, iPhone, and iPod touch.