I messed with the sources of Cygne and Oswan half a year (or something) ago and sorta hacked them together.
What I mean is that I inserted Oswans fixed/enhanced CPU core into Cygne and changed some things around to fix some other bugs (in... the emulation main loop, also changed some initial I/O register values).
To be honest, pretty much the only real work I did here was with I/O register 0xCD which is used by Digimon Tamers Battle Spirit - which sets its in-game language according to it -, I added layer toggling and made some GUI changes... In case anyone wants this hack job, download here including source code: http://magicstone.de/dzd/temp/cygne_inofficial-v25.zip