A cajón is nominally a six-sided, box-shaped percussion instrument originally from Peru, played by slapping the front or rear faces with the hands, fingers, or sometimes various implements such as brushes, mallets, or sticks.
Check out these audio plugins and soundware (samples, presets, etc.) and plugin hosts for all operating systems (Windows, MacOS, Linux, iOS and Android), tagged as Cajon. They are sorted by date added (newest first).