Calibre Web - Calibre Web is a web app providing a clean interface for browsing, reading and downloading eBooks...
Bulk Image Downloader - With Bulk Image Downloader you can download full sized images from almost any web gallery.
Komga - Media server for comics/mangas/BDs with API and OPDS support.
Vov Picture Downloader - Download pictures from websites.
calibre - Ebook manager, viewer & converter
WFDownloader App - A free bulk image downloader application that also serves as a multi-purpose bulk downloader for your PC.