KR

Knowledge Representation is a highly flexible and dynamic prototype-based object system for Common Lisp. It is completely independent of CLOS and features among other things multiple-inheritance and value propagation using constraints, much like Cells or COSI do, but in case of the latter there is actual source code around.
It should run on SBCL, CMUCL and every other conforming Common Lisp Implementation. It might be categorized as library.
Julian Stecklina has taken this out of the Garnet code, ASDF-ified it and fixed some non-standard code. If you are interested, contact him.

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