ActiveRecord is a component of the Castle project. It is a lightweight ObjectRelationalMapper?.

See:

•  http://www.castleproject.org/activerecord/
•  http://www.castleproject.org/ - Note: I have seen important news about ActiveRecord on this front page that did not appear on the ActiveRecord home page (first bulleted link above)
•  http://en.wikipedia.org/wiki/ActiveRecord