LinkChecker - LinkChecker is a free, GPL licensed website validator.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
PowerMapper - Create visual HTML site maps and XML sitemaps for search engines of any web site quickly and easily.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.