> The launch of the Raspberry Pi Compute Module 4 family (reviewed in Issue 209) last year sparked an entirely unsurprising explosion of interest in designing carrier boards. This was aided in no small part by the Raspberry Pi Foundation’s decision to release its own in-house carrier board design under a permissive licence from which others could springboard with their own creations.

> Smartly designed with some clever features, the Tofu is a great carrier for a Raspberry Pi CM4 or compatible boards

Looks like something useful, at least as a form of additional documentation to CM4.