HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Wondershare PDFelement - All-in-one PDF editor