Moral systems

Overview
This page is intended as a catalog or directory of existing moral systems A moral system may include moral codes, i.e. a set of practical rules expressing the application of the moral system in a contemporary cultural context, but this is not a requirement for being considered a moral system.

Query
Are there any known moral systems, other than those primarily defined by their codes? Or, to put it more precisely, are there any moral systems whose underlying reasoning is actually explained, rather than just being expressed as a list of rules?