[Total Commander][1]: Alt+F7, advanced, search for duplicates: [x] size, [x] content. It uses similar algorithm like Duplicate Files Finder.

Licence: shareware, but you can use it forever, it only asks you to press a button on start. [Full text][2]:

> Total Commander for Windows is a Shareware (demo version) program. This means that you can test it for a period of 30 days. After testing the program, you must either order the full version, or delete the program from your harddisk.

[Far manager](http://www.farmanager.com/) can probably make it too.


  [1]: https://www.ghisler.com/index.htm
  [2]: https://www.ghisler.com/order.htm