Zero-configuration fan daemon for ThinkPads

 zcfan is a zero-configuration fan control daemon for ThinkPads.
 .
 Features:
  - Extremely small (~250 lines), simple, and easy to understand code
  - Sensible out of the box, configuration is optional (see "usage" below)
  - Strong focus on stopping the fan as soon as safe to do so,
    without inducing throttling
  - Automatic temperature- and time-based hysteresis:
    no bouncing between fan levels
  - Watchdog support
  - Minimal resource usage
  - No dependencies