Coco/S is a compiler generator that takes plain EBNF grammar files and features a SAX style call back API. It is written in Java and produces a JavaScanner (Lexer) and Parser for the language described by the input grammar.
Coco/S is a branch of the 2010/11 release of Coco/R for Java.
While Coco/R takes an attributed grammar file, Coco/S has a callback API. This has the advantage of a clean separation between grammar (EBNF) and Compiler/Interpreter.
Jura is a programming language which is also a structured data language - think XML for source code. Jura supports generics, transforms and on-the-fly language extensions. The project aim is to create a Jura compiler in Java and then port it to Jura.
This project is the port of Lua programming language to Java platform. It contains the bytecode compiler and interpreter, that use the same bytecode format as the original version, and partially support standard Lua library.
Janux is a project to port the java virtual machine directly on top of the Linux kernel using
bypassing the traditional posix enviroment. This results in very fast java implementation for linux and and opportinuty to develop java based operating syste
JB2CSharp is a port of the Java-Bison/Flex software developed by the Serl project at the University of Colorado, Boulder. Parsers and lexers will be able to use C# actions. The open source .NET project Mono has requested the port, and here it is.
A C++ port (a redesign implementation actually) of the CLIPS expert system . This will be done along the lines of the Javaport Jess, but full CLIPS backwards compatability will be maintained (even to the API level where possible).