MIT/W3C Jigsaw -- State-of-the-art Java Server

Jigsaw is a very recent (June '96) product with the WWW Consortium at MIT, let by Tim Berners-Lee (creator of the WWW concept and early software).
Jigsaw is HTTP server, written entirely in Java and offering a set of advanced capabilities.
Jigsaw model is fully object-oriented -- all server resources ('files' in the conventional document tree) are now exported as abstract objects with client-specific customizability support.
CGI mechanism is replaced by 'servlets' -- dynamic chunks of Java which are downloaded, executed or served on demand, and then automatically cached.
Support for multiplexing, session control, live connections, architecture neutral database abstractions is also available or emerging.
Current alpha release is 30K lines of Java.
W3C plans to use Jigsaw as a base prototyping and protocol development platform towards object-oriented, distributed, multimedia services, mobile computing and scripted language development for intelligent agents.