ReiKey

ReiKey 1.4

Free
Scans and detects keyboard "event taps" meant to intercept your keystrokes.
 
1.4.1 (See all)

ReiKey is an application that can scan and detect persistent keyboard "event taps" meant to intercept your keystrokes. ReiKey was designed to detect such keyboard taps, alerting you any time a new tap is installed. In other words, its goal is generically to detect (the most common type of) macOS keyloggers.