alt Hacker NewsI use PowerPoint for that.
Draw outlines, or use graphics, wire up clickable areas, and interaction flows, and you’ve got a presentable “live” demo that doesn’t run afoul of issues presenting demo sites to non-techies (placeholder text, ugly buttons, test domains, colours, etc).
I used Balsamiq for that. The “pencil” render of the shapes make it obvious to not discuss aesthetics issues and only focus on flows.