SiteAdvisor is a consumer software company dedicated to protecting Internet users from all kinds of Web-based security threats and annoyances including spyware, adware, unwanted software, spam, phishing, pop-ups, online fraud and identity theft.
We built a system of automated testers which continually patrol the Web to browse sites, download files, and enter information on sign-up forms. Our easy to use software for Internet Explorer and Firefox summarizes our safety results into intuitive red, yellow and green ratings to help Web users stay safe as they search, browse and transact online.
I have been using it for about a week now and have come across some sites which I often visit with a red or yellow warning indicator. This is often because the sites in question link to software downloads, some of which are classed adware. A version for Internet Explorer is also available.