These guys have a long history of delivering distributed applications to the net community. They've tackled the problem of sending signed, encrypted code around. Check out Grail , their web browser that supports applets. Caml Special Light MMM is a web browser written using this ML dialect. The GUI is Tk-based.
Obliq objects have state and are local to a site.
Obliq computations can roam over the network, while maintaining network connections. Non-commercial use license. Alan Kay's group. ANDF Architecture Neutral Distribution Format. Another mobile code technology based on parse trees rather than opcodes.