Folder Marker - Change folder color in two mouse clicks for easy at-a-glance identification.
Xmind - Xmind is a brainstorming and mind mapping application.
Dr. Folder - Customize windows folder
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Teorex FolderIco - FolderIco allows to change the color of Windows folder in one click!
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.