SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.
Scapple - Scapple is an easy-to-use tool for getting ideas down as quickly as possible and making connections...
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Freeplane - Freeplane is a powerful and free software for building mind maps.
Xmind - Xmind is a brainstorming and mind mapping application.
Visual Understanding Environment - Visual Understanding Environment (VUE) is a mind-mapping and concept-mapping tool.