VisualSitemaps - Autogenerate visual sitemaps in seconds.
Xmind - Xmind is a brainstorming and mind mapping application.
Codrops Blueprints - Free website concepts ready to implement or modify
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
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.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.