HATs for Raspberry Pi
Raspberry Pi HATs and related boards
Stack HAT for Raspberry Pi, stacks up to 5 HATs at once (WS Stack HATx5)
This is an I/O expansion kit designed for Raspberry Pi, which provides 5 sets of 2x20 pinheaders, that means a handy way to "stack" multi different HATs together, and use them as a specific combination/project.