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'. There are three alternatives to Chordless for a variety of platforms, including Linux, Mac, Windows, Java and SourceForge. The best alternative is FreePastry, which is both free and Open Source. Other great apps like Chordless are NChord (Free, Open Source) and Open Chord (Free, Open Source).
NChord is a C# implementation of the Chord distributed hash table. The project provides a library containing the routing, lookup, and maintenance routines specified in the MIT Chord paper, and is quite stable including under heavy load and churn.