HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
SiteSucker - SiteSucker is a Macintosh application that automatically downloads Web sites from the Internet.
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Offline Explorer - MetaProducts Offline Explorer is a Windows NT/2000/XP/2003/Vista program that allows you to...
Platforma - Wireframe library of layouts and UI elements