Helm
Miscellaneous Information
Helm is a free, cross-platform, polyphonic synthesizer with a flexible modulation system. Helm is open source and you are free to run it anywhere, study and change the source code, and redistribute exact or modified copies of Helm.
Helm runs in GNU/Linux, Mac OSX and Windows.
Run Helm as a standalone synthesizer or as an LV2, VST, VST3 or AU plugin.
Comes in both 32-bit and 64-bit versions