HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
UI Movement - The best UI design inspiration, daily
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
Muzli - UI/UX and Design Inspiration Chrome Extension
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
UI Jar - Hand-picked design inspiration for your real life projects