XM6
XM6 is a Sharp X68000 emulator. Last released version was 2.06, in late 2006. The source code is available, but only for versions up to 2.05.
VGM Logging
A version of XM6 2.05 with added VGM logging can be found here, however, XM6 Pro-68k now has built-in VGM logging, so we recommend using that instead, since it is more up to date.