Axure RP (full name: Axure Rapid Prototyping) is a professional, fast and very efficient interactive product prototype designer. It enables you to quickly create a complete product prototype that combines notations, descriptions, flow charts, wireframes, and many other elements. Thereby, you can completely and clearly express your products to all aspects of designers, and then constantly perfect it in later discussions and collaborations between multiple different departments.

If you often draw sketches, wireframes to differentiate the page layout and function before building your websites, then you'll love this abundant and practical free 120+ UI components vector material for website layouts. They were released in AI, EPS, SVG (100% vector & fully editable) file formats by Petr Knoll from Czech Republic.