Wheat is a language and environment for creating dynamic web sites like blogs and portals: Every object has a URI, the virtualmachine is a web server, and the development environment is a Wiki!
NerveBreak is a scripting language, library and system. It can be used as a standalone scripting language (like Perl) or as a C library (like Lua). It has a C-like syntax and it compiles the source code to virtualmachine byte code for faster execution.
Jaguar is a browser totaly written in Java, it will run on every operation system where a Java VirtualMachine 1.3 is installed. The Browser is not designed to render very complex and big webpages, it will only support simple tables and simple webpages.
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nsjava is a loadable c-module which embeds a java virtualmachine 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.