With the advent of the semantic web, several projects have started to translate this bibliographic information to RDF. bibtex2rdf is a highly configurable translator from BibTeX to RDF which allows to do exactly that.
MALLET is an integrated collection of Java code useful for statistical natural language processing, document classification, clustering, information extraction, and other machine learning applications to text.
"This is one of the most intellectually challenging programming books that I have ever read...I strongly recommend that all Java programmers read this book."
This software is a translation into C++ of the excellent Webgraph library by P. Boldi and S. Vigna. The original library, written in Java, is easy to use but hampered by some requirements of the Java virtual machine. This C++ translation attempts to preserve much of the ease of use (through integration with the Boost Graph Library), but bypass requirements imposed by a virtual machine.
Axis2: Why bother? The Axis team is kicking up a big fuss about their recent release of Axis 2 (1.0!) Surprisingly, this library is so so abysmally bad, that I have yet to find someone who has managed to successfully use it.