Beyond Compare - Beyond Compare allows you to compare files and folders.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.