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