HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Bulk Image Downloader - With Bulk Image Downloader you can download full sized images from almost any web gallery.
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
Vov Picture Downloader - Download pictures from websites.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
WFDownloader App - A free bulk image downloader application that also serves as a multi-purpose bulk downloader for your PC.