As a web designer or developer building a site, it's helpful to first scout similar websites (i.e. the competition) to help you make design and development decisions. Knowing what websites work and which ones tank can give you insights and inspiration on what design elements, website features, and website content is effective.

To help you in your analysis, here are 15 top-notch, free, and simple web tools to help you learn more about a particular website.

1. Yahoo! Site Explorer

Site explorer allows you to inspect certain aspects of