It didn’t really stay personal, but I built a very basic Raspberry Pi Pinout website hosted on a Raspberry Pi [1] back in 2013. The intent was to collect the pinouts for some boards I was tinkering with at the time. It got wildly out of hand since [2] [3], but I think the original site meets the spirit of this question.
1. https://web.archive.org/web/20130505194305/Pi.Gadgetoid.com/... 2. https://pinout.xyz 3. https://pico.pinout.xyz
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