FreeBSD

FreeBSD is a Unix-like OpenSource Operating System. The mascot ot This OS is the BSD Daemon. Daemon in software means a service, which runs in the background and activates itself upon a certain trigger (activity on a port, a certain time has passed, system load below a certain level), the mascot however is a cute, red devil. The unprecedented level of unity in the BSD community led to it having different names: it is either Chuck or Beastie (which is phonetic for 'BSD'). While the OS-tan is rarely seen, another phenomenon exists around this Operating System, which resembles the OS-tans too much to remain unmentioned: Devilette, a brunette woman garbed in a latex catsuit with horns and a tail, stylized after the BSD Daemon.

See also:

• List of OS-tans

Wikipedia article about Devilette