Quite apart from commercial security companies, often unnoticed and unappreciated, are many thousands of web warriors who donate countless hours to keep you safe by exposing weak security, code exploits, malware, fraud, spam, and sleaze on the Internet. Use the following free services to get reports on any web site.
URLVoid draws from multiple automated scanning engines to report a variety of issues which may be found on a given web site. The initial URLVoid summary report provides links to detailed reports from each engine, plus additional scanning engines and tools you can use. Be patient, it takes a few extra seconds to create this report.
Web of Trust tracks web sites' trustworthiness, vendor reliability, privacy, child safety, and other issues by community ratings combined with trusted online listings. Notably, WOT moderates results according to the reliability of the contributors themselves to avoid rating fraud.
Notice the little colored symbols next to the above links. This page uses a WOT widget to make links self-reporting. You can customize a WOT widget for your own web site, or download and install the WOT toolbar in your browser to provide immediate feedback on search results and web sites you visit.
Briefly, green is good and red is bad - view the complete list of WOT Rating Symbols. Optionally, the toolbar can block your browser from loading a poorly rated site unless you manually override the block.
There is no special mojo in the above form. To manually accomplish the same tasks, modify and enter one of the following in your browser's address bar, then click Go> or press the Enter key on your keyboard:
http://www.urlvoid.com/scan/example.com
http://www.mywot.com/en/scorecard/example.com
Please understand: enormous effort has been put into these services and the results are generally reliable, but no rating system is infallible. Infrequently, both good and bad sites can be misrated. If so, corrective procedures are available.
Note that a site may be rated poorly - even though it has no malware, spyware, browser exploits, or adult content - if for example it's purpose is to sell counterfeit or dangerous products. Programs used by most rating sites can detect malicious software, but not corrupt business. WOT's advantage is the addition of ratings by humans.