A revised version of Hydra, an adaptive particle-particle, particle-mesh plus
smoothed particle hydrodynamics code developed by; Hugh Couchman, University of
Western Ontario, Frazer Pearce, University of Durham, Peter Thomas, University
of Sussex, is now available as a tar file from;
http://coho.astro.uwo.ca/pub/hydra/hydra.html or
http://star-www.maps.susx.ac.uk/~pat/hydra/hydra.html .