Kali Linux is a specialized distribution targeted at security professionals that also shows up on popular TV show, Mr. Robot. Kali Linux is now compatible with the Raspberry Pi 4. Currently, the distro is only available as a 32-bit OS, but the project is planning on releasing a 64-bit version soon. In the meantime, security aficionados who have a spare Raspberry Pi 4 lying around can head over to the Kali Linux site and download the distro image. (Source: NoteBookCheck)