Xmind - Xmind is a brainstorming and mind mapping application.
VisualSitemaps - Autogenerate visual sitemaps in seconds.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Codrops Blueprints - Free website concepts ready to implement or modify
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
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.