CLOS

The Common Lisp Object System is based on generic functions, multiple inheritance, and declarative method combination. Many implementations also have a meta-object protocol, or MOP, often based on that described in AMOP

Any purporting-to-conform ANSI CL implementation will have CLOS built in. There are also "add-on" implementations from before it was part of standard CL: Closette is the code developed in the AMOP book and probably not practically useful, whereas PCL is fully-featured (if slower than a typical tuned commercial implementation might be) and has been used as the basis for the CLOS support in e.g. CMUCL and SBCL

Web pages:

• Marty Hall's Introduction to the Common Lisp Object System can be found here
• This page describes the bare essentials of CLOS (Or would, if it weren't 404 See document at archive.org). It's from James Arvo's Caltech CS class.
• A Brief Guide to CLOS by Jeff Dalton.
• Tae-Sun Chung's CLOS Overview (Or would've been one, if it weren't 404. archive://)
• CLOS-DB is a database interface for the Common Lisp Object System.

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