[Jason Dunn]

Originally Posted by uzziah0

It is called DoubleKiller, and here is a like to their site:
http://www.bigbangenterprises.de/en/doublekiller

Thanks - this is the one I ended up using. It deleted about 9000 duplicate files. I found some decent tools, but it's shocking how hard many of them are to use. And some that are easy to use and powerful have completely crippled trial versions - so crippled they won't even delete one file.

Now on to processing these in Lightroom.