UPDOWNtoday - UPDOWNTODAY allows you to check whether the website is down or not.
HakuNeko - HakuNeko is an all-in-one cross-platform utility that supports you to download manga and anime with various website support.
IsThisSiteDown.org - Free tool to check whether a site is down just for you, or for everyone.
Free Manga Downloader (Unofficial Build) - Forked from https://sf.net/p/fmd/. Contribute to riderkick/FMD development by creating an account on GitHub.
Is it Down? - Is it down can check if a website is down or is it just your PC that can not access it.
HDoujin Downloader - A powerful doujin/manga downloader that supports hundreds of different websites.