Class system

• 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