Software that generates and plays artificial waveforms and instrument sounds through various forms of synthesis including wavetable and fm.
Fantastic free synthesizer from Native Instruments and Keyboard Magazine
ReBirth was one of the first virtual synthesizers and one that gained much recognition in developing the computer music scene with its digital recreation of the great Roland 303, 808 and 909 sounds.
Older version of the great popular Vaz + software synthesizer with many oscillators and ilters
SynthEdit is a shareware modular synthesiser with which you can design your own Synth from the ground up by dragging and dropping modular components, and connecting them with virtual patch cords
Open source and easy to use software vocoder
Software synthesizer emulating the classic sounds of the hardware 404
Good real-time modular software synthesizer with every module midi mappable
Midi input synthsizer with 10 independent oscillators
Drum synthesizer that reporduces 909, 808 and Simmons drums amongst others
DrumSynth builds sounds out of swept-frequency sine waves, noise bands, pink and white noise and complex waveforms