Which duplicate files and folders finders exist for Windows?

I need a free duplicate file finder/remover app, with ability to find duplicate files/folders by name and/or by size and to remove one of duplicates.

Answer

There was this Duplicate File Finder available for some time but now its only on secondary sites, like this Softpedia reference.

The Wareseeker site shows the correct reference http://dff.nazrashid.com/ which is no longer around. I would be careful fetching executables from such sites though.

It can do search for duplicates within multiple directory trees based on,

contents (i think it does a md5 match)

size

name

name and size

contents and name

And, it lets you filter your search by a minimum and maximum files size (speeds up things when you know the bounds).

A very thoughtful piece of software. Don't know if there is something as fast and featured for free around these days.

The comments refer to a similar Sourceforge tool called Doubles

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