F. Wolff has released the final 1.0 version of Ejen, a Java/XML/XSLT system (currently implemented as an Ant task) designed to facilitate the creation of code generators.

The Ejen intro page notes that:

a salient feature of this system is that it allows the use of almost any kind of text file as input, without the need of developing lengthy and complex Java extensions

Ejen is free software, released under the GNU GPL. The Ejen project at Sourceforge is the home for the source code, which is browsable via the project ViewCVS interface.