Typeeto - Use Mac’s keyboard to type on iPad, iPhone, Android, etc.
Type2phone - Type2Phone: Use your Mac as keyboard for iOS devices
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.
Synergy - Cross-platform software for sharing your mouse and keyboard between multiple computers
Input Director - Control multiple windows systems with one keyboard/mouse. Share a keyboard and mouse across multiple windows system.