How strong is your website? Tool to show you approximately where your website stands on speed, SEO, mobile-friendliness and more.
SneakPeakIt: Printable Wireframes
Source: http://sneakpeekit.com/
Various Device Mockups
CreateBrief.com: Super Simple Web-based Creative Briefs
Every Website Looks the Same, and That’s OK
Pattern: Turn Etsy Shop into Your Own Website
Vivaldi: Customizable Web Browser
Website Grader
Pattern Library
This on-going project compiles patterns shared by the most talented designers out there for you to use freely in your designs.