Kansas

enigo.com/projects/kansas/

This a similar idea, and a more mature product. My only objection is stylistic: I don’t personally like the feel of the Kansas framework. Possibly I should just have wrapped Kansas in a layer that worked more the way I like. Go and have a look at this one.

SOP

day-reynolds.com/lennon/index.php/code/sop

Again this is a similar idea, but I found it too hard to customise the behaviour it gave me. (And I needed to be able to customise the behaviour to be able to cope with DBD variations.)

Criteria

mephle.org/Criteria/ is too table-orientated for me.

Lafcadio

lafcadio.rubyforge.org/ is for MySQL only.