Chordless is described as 'Chord and DHash implementation written in java. It implements almost everything from Chord and DHash described at http://pdos.csail.mit.edu/chord/ , as well as some extra features such as transactions and remote method invocation' and is an app. There are three alternatives to Chordless for a variety of platforms, including Mac, Windows, Linux, SourceForge and Java apps. The best Chordless alternative is FreePastry, which is both free and Open Source. Other great apps like Chordless are NChord and Open Chord.
FreePastry is an open-source implementation of Pastry intended for deployment in the Internet. The initial release of FreePastry is intended primarily as a tool that allows interested parties to evaluate Pastry, to perform further research and development in P2P substrates, and...
OpenChord is an open source implementation of the Chord distributed hash table as described in the paper by Ion Stoica et al. "Chord: A scalable peer-to-peer lookup service for internet applications".