JSwiki

• Klass - a utility for creating expressive classes in JavaScript.

• Oorja - Library provides basic Class structure for Javascript. Keeps in mind the C++ style OOP.

• Fiber

• My-Class

• Species - JS Class structure, Java style OOP.

• Proto.js - Prototypes as classes, and read this "prototypes as classes"

• Joose

• JS.Class

• ComposeJS

• Clasico

• self

• jsface - a small and fast Class system

P.S. http://habrahabr.ru/post/132698/#comment_4404597