A Java Virtual Machine for OpenJDK
Manifold is a Java compiler plugin, features include Metaprogramming
Portable version of the multifunctional development platform Eclipse.
Best IDE for Beginners
Translate java source into another language
Java Bytecode Viewer & Decompiler
HATE's an ASN.1 Text Editor.
Better Modularity, Better Concurrency
A Proof of Concept for programming in English
A PEG based parser generator, with advanced features