Since I frequently store data in vertex color channels, I have noticed that most 3D software lacks the capability to display each channel separately. Although there are options to create custom shaders or view modes in software like Maya, Blender, 3ds Max, and Unreal to add this feature, I have opted for a more universal approach: a channel viewer that can be overlaid on top of any other software. It's written in C# and is started separately from your main DCC software.
It is always displayed on top, and all options are mapped to hotkeys to make it easy to use.
The source code is available on GitHub: https://github.com/HaukeThiessen/ChannelViewer