Sonigen Modular is a virtual modular synthesizer for Windows.
"Sonigen Modular is a modular software synthesizer which offers you the freedom and flexibility of classic modular synthesis with high quality sound and efficient cpu usage."
Sonigen Modular Features
Fully modular, you can add as many modules and patch cables as you want.
A fast and intuitive user interface. Layout is mostly automatic, cables indicate signal flow, and our (unique as far as I know) dynamic input handling reduces the need for extra mixer modules, and also reduces screen wastage from unused input terminals / knobs.
Modular voice and modular output effect processing both cleanly integrated in one window.
Everything is processed at full sample rate so there is no need to differentiate between audio signals and control signals. This makes it easier to use and also more flexible.
Just in time (JIT) assembly. Not only is the audio engine written entirely in assembler, but it is also dynamically assembled at runtime. This enables a whole class of optimizations that are otherwise impossible with pre-compiled binaries.
Sonigen Modular is available for Windows in stand-alone and VST instrument plug-in formats. It's free whilst in beta.