FarmOS is a web-based system for managing an operating farm. It is still in the early phases of development, as we build out the data types and relationships. It is built on top of Drupal (http://drupal.org).
A working demo is available for folks to play around with at: http://demo.farmos.net (message @m.stenta for a login: http://farmhack.net/user/1999/contact)
Join in the discussion on IRC at #farmOS (on Freenode): irc://irc.freenode.net/farmOS
More info: http://farmos.org