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.
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
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.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .