Digital software synthesizers and samplers, software piano and percussion modules...

Music Sotware Developper, for windows and mac (RealGuitar)

Developper of INetSynth, a virtual synthesizer for mac and pc

Offers several music related programs for the Macintosh, including Audiocorder, Sound Byte, and MacDSP.

NUSofting produces high-quality audio software for the Windows and Mac OS X platform. VST, AU and DirectX plug-ins.

Developer of audio plug-ins for Mac OS X and Windows

SFX Machine is an award-winning Premiere-format multi-effects and modular synthesis plug-in for the Macintosh. It is now available directly from its creator, The Sound Guy, at a special low introductory price.

Sonic Charge : developper of MicroTonic, a VSTi percussion synthesizer for windows and Mac OS X

SpinAudio Software is a company that develops audio signal processing plugins and supplementary tools for a computer based audio production that can range from music creation to multimedia and film/video post-production. They specialize in delay effects, Virtual Room Acoustics Modeling, 3D Positional Audio and real-time Spectral effects.

Sounds Online is a division of EastWest, a company specialized in sound libraries development and distribution. High quality virtual instruments and sound libraries editor.