MangaReaper
Automated mangas downloading and managing tool
... such as automatically deleting mangas after a certain number of days or chapters, or viewing the list of the unread chapters.
This tool aims to be as flexible and configurable as possible. Even though it's a bash script, all the interactions are done graphically, thanks to Zenity's fork, Yad.
*** Update ***: A new portable Perl / Gtk3 version is currently under development. The bash version ow serves just as a demo.