Juno 6 is a free software synthesizer developed by juno6.gruftie.com. Available format(s): VST for Windows.
Juno 6 is an open source VSTi that emulates the sound of the original Roland Juno 6/60 Synthesizer. The project itself is based on the ultramaster juno 6 linux sources.
The source is released under the GNU public license (GPL).
http://juno6.gruftie.com/