OForth

Oforth is for Object + Forth : while based on Forth philosophy (data stack, one pass compilation, ...), it implements a full object metamodel.

Features include :

• Dynamic language (which does not mean a slow language).
• Oforth comes with an REPL : you can try things interactively.
• Object metamodel : everything is an object.
• Automatic garbage collection.
• Support of functional programming style and closures using blocks.
• While mutability is allowed, immutability is the default behavior, and sometimes required.
• Support of parallelism using light-weight tasks and communication using channels.
• Very concise language : "the more code you write, the more bugs you have"

http://www.oforth.com/