Geof Crowl:

After posting about the OpenStep User Interface Guide, I started to wonder how many different human interface guides or software design guides that I could find from the past and present. It doesn’t seem like there’s a good collection of these anywhere on the internet, especially in regard to past software design guides. I think there’s a lot of value in these even outside of just being a historic reference.

An excellent starting place, whether you’re looking for help designing your UI or help designing your UI design guide.