HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
iTerm2 - A terminal emulator for macOS that does amazing things.