Helm is a low cpu free polyphonic synthesizer created by Matt Tytel, it is completely open source and specialises in modulation with several envelopes and LFOS available for mapping. Sounds can be created efficiently with a simple waveform selector, sub module, filter and a mixer. The open source nature of the VST allows for savvy users to completely customise their Helm experience.

Helm is released as VST, AU, LV2 and standalone.
OS Requirements:

• Windows 7 or later
• MacOS 10.7 or later
• Ubuntu Trusty 14.04 or later
• Debian Jessie or later

Click here to the download the plugin and do support the developer with a donation if you enjoy it.