Kinda sad fdisk.com has been dead since March-ish.
It had been my favoritie non-ssl site for double checking captive portal shenanigans without having to wrestle with https everywhere.
I have a lot of nostalgia for it, as it was both a very useful repository of tools for interneting with #DOS and fdisk tips & tricks alongside a wealth of DOS partitioning tool links.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko