Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
KeyCastr - KeyCastr lets you easily display your keystrokes while recording screencasts.
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
Screenkey - Screenkey is a screencast tool to display your keys inspired by ...
1keyboard - Type on your iPhone, iPad or AppleTV using your Mac keyboard
Carnac - A utility to give some insight into how you use your keyboard/