4ormulator Vocoder Extreme: Commercial vocoder for Windows with free demo. Supports more than 500 filters, formant manipulation and LFO control.
AnalogX Vocoder: Free multiband standalone vocoder for Windows.
Cylonix: 18-band standalone vocoder for Windows.
Native Instruments Vokator: High-resolution commercial VST plugin and standalone application for Windows and Macintosh. Also has synthesizer functions utilizing fast fourier transformations (FFT).
OrangeVocoder: Realtime commercial VST plugin for Macintosh and Windows. Many examples and demo available for download.
Settel Vocoder: 16-band standalone and LADSPA plugin for Linux.
Zerius Vocoder: Free simple standalone vocoder for Windows, Mac and BeOS.