FOSS Directory-based Gallery App?

I'm looking for a file manager or gallery app that will let me browse to particular directories easily (prefer a file manager interface for this), look at images I find in them, and (this seems to be the really hard part) easily rename them while I'm looking at them. I don't want a conventional gallery app that just presents one huge list of all the folders it found anywhere on my device, as there can be several with the same name, and it's tedious to figure out what directory each one is under. I need to be able to go to a particular directory, look at the images within, and rename them while looking at them - the quicker & easier the better.

Help?