... in the output window, typically displayed in full-screen on an external monitor or a projector. But the output can also be saved as a video file.
Control GLMixer through network using OpenSoundControl, and generate graphics with ShaderToy GLSL code.
Download : https://sourceforge.net/projects/glmixer/files/
Please note GLMixer is discontinued and superseded by vimix
https://brunoherbelin.github.io/vimix/