Kreatrix is dynamic prototype based object orientated language. It has been inspirated by Io and Self. The syntax is similar to Smalltalk. It has small VM with modules (like Python). Some modules bind external library, for example: GTK+ and SDL.
Susie (Scripting Using a Smalltalk Interpreter Engine) is an attempt to provide a light weight scripting engine using Smalltalk as the language. it is based on Public Domain SmallTalk (PDST).
Hummin is open Smalltalk-80 implementation with ANSI Smalltalk compliant
class library. It is file based and therefore modular. It could
be used for object oriented scripting as well as for rapid application
development.
Mirror is a full featured object oriented programming language. In Mirror all programmatic entities are first class objects, actions are performed by sending messages to objects ala Smalltalk, and binding is dynamic and performed at runtime.
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Squeak is an open, highly-portable Smalltalk-80 implementation providing platform-independent 2d and 3d graphics, sound, and network access. Active development of Squeak is going on elsewhere than SourceForge now, meet us at squeak.org.