A Real Validator - 1.01 

A Real Validator is an HTML syntax checker for Windows. Unlike other HTML "validators" for Windows, A Real Validator uses a sophisticated SGML parser to give true HTML validation.

Bobby - 3.1.1 build 6 

Bobby is a java based web site validator released to meet the needs of developers who want to make the Web universally accessible. Developers can test sites and generate summaries highlighting the most critical issues. Bobby has an Intelligent interface that makes this program easy to use for beginners and advanced users.

CSE 3310 HTML Validator - 4.0 Beta 2 

A very nice and easy to use HTML validator. You can drag and drop your HTML documents on this and it returns you a very thorough list of the errors in the HTML in plain english, even tells you exactly which tags conspire to make the error! (as in when you have overlapping tags, it will tell you exactly which ones, and so forth)

CyberSpyder Link Test - 2.1.7 

CyberSpyder Link Test is a Webmaster's friend as it will check all the links on a site and report on any that no longer work as well as producing analysis reports to simplify site management.

Linkbot Pro - 4.1b 

Linkbot Pro 4.1, created by Tetranet Software, is one of the industry's most complete Website testing solutions. Benchmark your Website against the best. Linkbot Pro now includes the Site Quality Rating Report, allowing you to quickly compare your Website against your peers and competitors. Linkbot Pro 4.1 is now even more powerful, along with the ability to parse through JavaScript and HTML 4.0, Linkbot Pro can scan through FORM tags allowing you to check all sections of your site. Linkbot Pro contains all the tools Web developers need to keep even the largest Website problem-free.