GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most widely-used Internet protocols. It is a non-interactive command line tool, so it may easily be called from scripts, cron jobs, terminals without X-Windows support, etc.
simple, terminal based, can do a lot. somewhat hard use if you are not a terminal user.
It's a powerful tool, working neatly.
A great explanation and how-to-download-a-whole-site can be found here: https://alvinalexander.com/linux-unix/how-to-make-offline-mirror-copy-website-with-wget/
Pending approval
Wget can actually manage a lot of things download managers (e.g. jDownloader, uGet) can do. Recursive search, wildcards, etc.
It's part of every Linux distribution and runs on Windows with either Cygwin of Services for Linux.