PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
HakuNeko - HakuNeko is an all-in-one cross-platform utility that supports you to download manga and anime with various website support.
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
Hitomi Downloader - Desktop application to download images/videos/music/text from Hitomi.la and other sites, and more.
PDFChef Merge PDF - PDFChef Merge PDF is an online tool that allows you to merge multiple PDf files into one quickly and securely.
HDoujin Downloader - A powerful doujin/manga downloader that supports hundreds of different websites.