Helm by Matt Tytel

Run Anywhere

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

This means you are free to run Helm anywhere without the pains of DRM, you can study and change the source code and redistribute exact or modified copies of Helm.