Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
XML-Sitemaps.com - Free Online Google Sitemap Generator.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny
PowerMapper - Create visual HTML site maps and XML sitemaps for search engines of any web site quickly and easily.