Maybe this is old hat to some of you, but I just found it and thought it worth a mention here
Basically a DX-7-emulation and it reads the DX files for patches. I think it does even more, like being an editor for a real DX 7…
Anyway, I like it. I always loved those FM Sounds. So clean and pure.
Some patches to go with it: http://bobbyblues.recup.ch/yamaha_dx7/dx7_patches.html
Use, install at own risk.