Protobj: Prototype-Delegation Object Model in Scheme by Neil Van Dyke code copied from http://planet.racket-lang.org/display.ss?package=protobj.plt&owner=neil
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Purely-functional Object-Oriented System - The present code implements a classless, delegation-based OO system, similar to those of Self or Javascript. This is a full-fledged OO system with encapsulation, object identity, inheritance and polymorphism. It is also a purely functional system: there is not a single assignment or other mutation in the code below.
EnvDraw is a environment diagramming package which draws environment diagrams as taught in Abelson and Sussman's _Structure and Interpretation of Computer Languages_. NB None of the links in the announcement and readme work http://kaolin.unice.fr/STk/Archives/96/1275.html
The Prometheus Object System, a prototype-based object system inspired by Self.
Public repository.