FMHeaven, as the name suggests, is an FM synth with the following features:
The new version of FMHeaven includes a pair of multimode filters. Each filter has a separate cutoff envelope, and each of the 6 oscillators can be output directly to the output bus, or through the filters. This allows the filters to be used on some oscillators, but not on others, offering some interesting options.
The default sound bank now includes new sounds by Summa which take advantage of the filters to great effect.