GlooMaps - Create your visual sitemap on the go - easy peasy
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
XML-Sitemaps.com - Free Online Google Sitemap Generator.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
XmlSitemapGenerator.org - Easily create HTML, RSS and XML Sitemaps online for free.