Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
VisualSitemaps - Autogenerate visual sitemaps in seconds.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
SlickPlan - Slickplan is a suite of tools for planning any website project.
GlooMaps - Create your visual sitemap on the go - easy peasy