This app is based on openFrameworks. It is able to receive multiple Syphon streams, allows you to quad-warp them, reduces their resolution and sends everything out as another combined Syphon stream.
Get it here: https://github.com/Andymann/ofxSyphonProxy
As an example I have a simple VDMX-setup that consists of 2 individual layers. Each layer is sent out via Syphon.
