Lambda the Ultimate

Poly* is a novel retargetable meta type system for various process and mobility calculi. Poly* is a direct descendant of PolyA, a type system for Mobile Ambients by Amtoft, Makholm, and Wells. Meta* is a generic process calculus that can be instantiated to specific process calculi like the Pi-calculus and Mobile Ambients by supplying reduction rules.

A web interface is available for experimentation after you can read the technical report and ESOP 2005 paper.

The list of common questions and answers about Poly* may be a good place to start if you are merely curious.