[Dissley]

millionshort.com looks promising! I will give it a try. Do you know what engine they use? Google or Bing, or something completly different?

[PhasmaFelis]

I had to dig for it, but apparently they use "a Microsoft Bing API and some in-house information." https://www.networkworld.com/article/2188911/million-short-s...

I should edit the Wikipedia page; it makes it sound like they rolled their own engine and crawler, which seemed pretty unlikely.