Is there any open-source photo gallery that lets users download multiple images?

I’ve looked at some of the well-known open source gallery scripts, like Gallery, Plogger and ZenPhoto. While they all have great features, none seems to have a "multiple download" feature.

I want to be able to let users download the hi-resolution versions of images. I also want to allow users to download all images in an album.

Is there any script out there that offers this functionality?