farmOS

farmOS is a Drupal distribution and set of modules for farm management and record keeping on the web. The goal is to build a platform for farms of all types and sizes to manage their planning and record keeping in one place, available from anywhere over the internet.

Official site and documentation: http://farmOS.org

If you're interested in supporting the project, consider signing up for a hosted farmOS site through Farmier: http://farmier.com