We're compiling the best Holiday 2016 music gear deals. See them here.
Dexed can read DX7 patches, sounds quite like a DX7, is way easier to program than a DX7 and is completely free of charge. I'd happily pay 10€, if only they could make the GUI a bit better...
DEXED simulates the mighty Yamaha DX7 FM synthesizers of my youth. I still have one. Basically this thing is 98% a real DX7 sound but what you lose in sound quality DEXED makes up for with ease of programmability. While maintining the vintage Yamaha look in their GUI, Digital Suburban have incorporated the best virtual-knob and graphical controls from various popular DX7 midi-patch-creation freeware. This is much easier to program than your DX7, can load up actual DX7 saved patches and is just a joy to screw around with. I still use my DX7 when I want to grunge up an FM sound through a guitar amp or something, but if I want crisp, DI Yamaha sounds I go for DEXED.