Web ScrapBook - A browser extension that captures the web page faithfully with highly customizable configurations.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
HTTrack - HTTrack is a free (GPL, libre/free software) and easy-to-use offline browser utility.
Moqups - The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Offline Pages Pro - Offline Pages Pro is probably the world’s most advanced offline browser.
OmniGraffle - OmniGraffle is for creating precise graphics like website wireframes, an electrical system designs, or mapping out software class.