Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
Unshaky - Dismiss duplicate key hits on MacBook butterfly keyboards
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
KeyWi - Use your computer's keyboard to type on your iPhone or iPad
across - Across makes a Bluetooth equipped PC or Mac work as a standard Bluetooth keyboard/mouse combo.
Mocha Keyboard - Mocha Keyboard is a leading Bluetooth keyboard application for iPad, iPhone, and iPod touch.