Munt is a multi-platform software synthesizer that accurately emulates pre-GM MIDI devices such as the Roland MT-32, CM-32L, CM-64, and LAPC-I.
Munt will install drivers to accomplish this emulation. Munt is relatively easy to use. You can test the MIDI driver from the Tools menu, add a new MIDI port, and play or convert a MIDI to WAV. Options are also simple with starting iconized, show LCD balloons, and ROM configuration. Finally, help only is an about tab, so there's no help available.
Munt is a pretty neat open-source app with that unique, niche thing going we love at MajorGeeks.