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