Rafal Tomal has shared with us his Free Photoshop Wireframe Kit. This wireframe kit includes Notes, Images & video, Form fields, Headings, paragraphs and bullet lists, Navigations, Ad banners and Common website elements like: search box, email sign up form, etc.

Simple open a blank Photoshop document in one of my screens and the wireframe kit PSD in the other one. Then, simply drag the elements you need from one document and drop them into the other one. As you can see, all elements are black in my wireframe kit. You can easily change the background by managing the opacity of the element.

Requirements: Photoshop
Demo: http://rafaltomal.com/free-photoshop-wireframe-kit/
License: License Free