The Mozart Development Environment is a framework for user-extensible compilers and development tools, including a Java-to-Java extensible compiler, ideal for Java code refactoring. Also includes the new LX programming language.
The Mozart environment release 1.0 has been submitted, including the Moka Java-to-Java extensible compiler. These components are very usable in their current form.
There is a separate "experimental" branch (currently at release 0.1LX) for the LX compiler.