This file manager app is from Roxy. I discovered it whilst looking for a picture uploader for CKEditor, and of the 4 I tried, this was the simplest to use and did all that it claimed to do. Elfinder I didn't actually try. The demo seemed to work OK, but it was too over-featured and over-complicated for me. It did many things that I would never use. Responsive File Manager looked good and seemed like it would fit the bill. But it would not upload pictures greater than about 500Kb, so no use. ( and yes the PHP FileSize Limit was 10Mb.) KCFinder looks similar to Roxy ( this one ) but I could not figure out how to make new folders.
Roxy works well in CKEditor and also as a standalone file manager, so I think we'll stick with this and spend a bit of tiem tweaking it.
I should mention that the CK folks do their own file manager, called CKFinder, which works very well, but it not free. The last time I looked it was about $17 per MONTH.
And you can try fileGator ( on the same menu tab ) which is great, but does not integrate with CKEditor.