Kaya: A statically typed, imperative cross-platform programming language with type inference, powerful data description capabilities and built-in abstractions and libraries for easy and robust web application development. http://kayalang.org/
TTApp is an web-application framework based around Template Toolkit. What TTApp sets apart from similar projects is that it does not rely on mod_perl, and can be used on your $5/mo. virtual host. (Perl Volunteers Wanted).
DO browse the CVS!
nsjava is a loadable c-module which embeds a java virtual machine in aolserver. This module is being developed to support the openacs project - see http://openacs.org, but it could find general application as a web development tool.