HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
You-Get - Command-line utility to download media contents from the web
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
YouTubeDLD - World's most efficient YouTube downloader. No spam or ads.
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.
Every Second - Realtime stats per second of Apple and YouTube