Muzli - UI/UX and Design Inspiration Chrome Extension
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
UI Garage - Specific mobile and web design patterns for your inspiration
GNU Wget - GNU Wget is a free software package for retrieving files using HTTP(S) and FTP, the most...
Design Hunt - Curated design inspiration for everyone
WebCopy - Cyotek WebCopy is a free tool for copying full or partial websites locally onto your harddisk for offline viewing.