Acknowledgements

The present SWAN team are grateful to the original authors from the very first days of SWAN which took place at the Delft University of Technology in Delft, The Netherlands in 1993: Nico Booij, Leo Holthuijsen and Roeland Ris.


We further want to acknowledge all contributors who helped us to improve SWAN, reported bugs, and tested SWAN thoroughly: Tim Campbell, John Cazes, Casey Dietrich, IJsbrand Haagsma, Agnieszka Herman, Jim Kaihatu, Kees Kassels, Annette Kieftenburg, Ekaterini Kriezi, Roberto Padilla-Hernandez, Erick Rogers, Gerbrant van Vledder, Kees Vuik, Andre van der Westhuysen, James Salmon, Pieter Bart Smit, Gal Akrish, Ad Reniers and Marcel Zijlema.


Many thanks are due to Gerbrant van Vledder ($\dag$) who provided the source code XNL for exact computation of four wave-wave interations.


It was also the important role which SWAN played in several projects, mostly funded by the Office of Naval Research (USA), which helped a lot to develop and maintain SWAN. The present version of SWAN is supported by Rijkswaterstaat (as part of the Ministry of Transport, Public Works and Water Management, The Netherlands).


We are finally grateful to all those other people working on the Public Domain Software without which the development of SWAN would be unthinkable: Linux, GNU Fortran, L^ATEX, MPICH2, Perl, CMake and many others.