HTTrack is described as 'Free software that downloads entire sites to local storage for offline use, maintaining the original link structure for seamless browsing' and is a very popular website downloader in the web browsers category. There are more than 25 alternatives to HTTrack for a variety of platforms, including Mac, Windows, Linux, Web-based and Google Chrome apps. The best HTTrack alternative is WebCopy, which is free. Other great apps like HTTrack are ArchiveBox, Wget, SiteOne Crawler and SiteSucker.
WebCopy have more modern interface design than HTTrack, and for basic use mostly does the same job.