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Cygne
http://cygne.emuunlim.com/
An open source emulator for Windows.
Oswan
http://www.bannister.org/software/oswan.htm
A freeware emulator for MacOS developed by David Raingeard and ported to the Macintosh by Richard Bannister.
WonderBoi32
http://info2.info.tampere.fi/%7Eteoarsa/Rattboi/Downloads/wsc.htm
A Wonderswan Color emulator for GP32. Includes source download.