FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
UVI Falcon - Sampler/synth hybrid instrument
ZynAddSubFX - ZynAddSubFX is an open source software synthesizer for Linux, Mac OS X and Microsoft Windows.
Pianoteq - Pianoteq is a virtual piano that runs on your computer.
VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...
LinuxSampler - LinuxSampler - free, open source pure software audio sampler with professional grade features.