I hope that you won't mind that this only shows built designs, but I think it's relevance to unbuilt projects is straightforward. I've always been interested in how some designs influenced others, even if there wasn't always a transfer of data/direct knowledge. But I couldn't find anything really bringing that together, so I made this. http://www.hisutton.com/World-Submarine-Family-Tree.html
Already on its second iteration. Feedback and corrections welcome!
Already on its second iteration. Feedback and corrections welcome!