Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Offline Explorer - MetaProducts Offline Explorer is a Windows NT/2000/XP/2003/Vista program that allows you to...