What about jDownloader?
Often times, I find myself using jDownloader to snag videos off YouTube to play in VLC, but I wonder. Say you had an Apache server where the images folder's read permissions were enabled across the board. Meaning if you pointed a web-browser to the absolute path, instead of "Permission denied" or "Not Authorized", you see "Contents of /images" and a screen fill of links to the image files. I'd be half tempted to copy-paste that absolute path into jDownloader and cross my fingers.