Apps similar to NChord include FreePastry, which is free and open source. Other options are Open Chord and Chordless. In total there are three apps like NChord for Mac, Windows and Linux.
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".
Chordless is a 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.
