Not fancy, but there are some excellent links here. Postscript and PDF file formats are provided. The routines are coded in a standard fashion and should be portable across a wide variety of platforms. OELib can be downloaded for free and a reasonable amoount of programmer notes are provided online. The codes themselves are available free of charge by contacting Steve Plimpton .
Documentation is available in all cases, as are links to vendor sites.
In some cases download access is provided to source code. The code is not yet at the distribution stage but some interesting papers and viewgraphs on the underlying methodology are downloadable. The resulting set of routines is targeted primarily at distributed memory machines and is highly tuned to multiprocessor MPI and PVM environments. The codes themselves have access controls and, although there is a guarantee of a free trial period, it is unclear what a permanent license entails. Online documentation is available, and the code may be downloaded for free for UNIX, Windows and Macintosh environments.