FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
Kontakt - With KONTAKT 6, you can sound like a snare drum, a symphony orchestra, or anything in between, from a universe of sampled instruments.
VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...
UVI Falcon - Sampler/synth hybrid instrument
Zebralette - u-he makes creative software synthesizers and effects.
Pianoteq - Pianoteq is a virtual piano that runs on your computer.