DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
PowerMapper - Create visual HTML site maps and XML sitemaps for search engines of any web site quickly and easily.
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.