question-answer.tar.gz contains JAR files like Javelin.jar, which code vanished from the public web.
Ephyra also contains some components that have been adopted from the JAVELIN system., though the link is dead: https://web.archive.org/web/20081203004045/http://durazno.lt... and it seems there exists no archived source code of it. https://web.archive.org/web/*/http://durazno.lti.cs.cmu.edu/... (not archived). Javelin was used in the TREC competition, and there a lot of papers about it e.g. http://www.cs.cmu.edu/~llita/papers/lita.javelin-trec2005.pd...
I wrote the maintainer of Ephyra an email.