another day, another web framework: Helma

Helma is an interesting-looking web application framework for Javascript. I haven't experimented with it at all, but its very existence amuses me after reading about Rhino on Rails. Before sneering too much about using Javascript for large-scale development, note that 1. Rhino Javascript is different (more up-to-date) from typical browser-supported Javascript and 2. Javascript can "feel" much different within a framework that performs OO prototype-modification (heard of Prototype?).

What are the choices now? There's Helma so one can use Javascript on both client and server, and there's GWT so one can use "Java" on both client and server. It's a mad, mad, mad, mad world (look under the big WWW).