ORM alternatives to ActiveRecord

Question

To begin with this post in no ways undermines ActiveRecord. I am pretty happy with it, but for the sake of knowledge and to try a few options are there any other alternatives to ActiveRecord available? Has anybody used some other ORM than ActiveRecord, if yes then which ORM is that? Please share your experience.

Answer 1

There is http://datamapper.org/

Answer 2

Try http://mongomapper.com/