This Wikipedia article goes over things:

* https://en.wikipedia.org/wiki/Go_First_Dice

As well as the pages of the project:

* http://gofirstdice.ericharshbarger.org/

A physical example of dice (USD 35):

* https://www.mathartfun.com/thedicelab.com/GFD5.html

* https://www.youtube.com/shorts/yMtTqiAhol8

* UK store: https://mathsgear.co.uk/collections/dice/products/go-first-d...

In addition to the above 5-player go first, they also have 4- and 3-player go first:

* https://www.mathartfun.com/dSpecial.html