Available as an assembled Module and as a DIY project.
This Module is currently available.
Stereo 8 In, 8 Out Matrix Mixer
The AI018 Eurorack Stereo Matrix Mixer is a compact 8-in, 8-out matrix mixer. A matrix mixer is used to route audio or cv signals from multiple sources to different destinations. There are sixteen potentiometers, with each potentiometer controlling the amount a given stereo input pair (1-4) will be sent to a given stereo output (A-D).
A common usage for the AI018 would be as an effects send, with one or more inputs, and one or more effect inputs and outputs. Using the AI018 Stereo Matrix Mixer in this way, inputs can be sent to multiple effects, and the effects can be sent to each other, and even back into themselves, expanding the depth of the effects.
https://aisynthesis.com/product/ai018-eurorack-stereo-matrix-mixer/
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These merchants probably sell this module. Huh?