Gersic es una enorme base de datos con cientos de plugins de audio freeware… esto es, GRATUITOS.

http://www.gersic.com/plugins/

There are hundreds, if not thousands of excellent audio plugins available for free on the Web. This database is an attempt to provide a useful index of them. New VST, DirectX, RTAS, and AU plugins are being added all the time, and you can submit your own favorite plugins using the «Submit Pluging» link above.