CiviCRM Rules extension
Big part of the "engine" of CiviRules is finished, with the rest being completed this month already. As with many other open source development, the rest is depending on funding.

The extension then needs to be populated with specific events, conditions and actions, just like Drupal Rules. We then hope many more will participate in adding those. @ErikH is the one to talk with.

Check: https://civicrm.org/blogs/erikhommel/civirules-sprint-january-and-march-2015 and/or http://redmine.civicoop.org/projects/civirules/wiki

(CiviRules should not be confused with the CiviCRM Rules extension, which simply syncronizes CiviCRM with Drupal Rules. This is the extension Eileen is referring to: https://www.drupal.org/project/civicrm_entity)