DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Xmind - Xmind is a brainstorming and mind mapping application.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Site Visualizer Professional - Crawl website, visualize pages and links, analyze the structure of a website, build SEO reports with SQL
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.