In a sense, tools for both stress management (biofeedback, meditation, etc.) are 'thinking tools' - but the thinking tools in this section are more about facilitating thinking and creativity in specific ways.

One of those ways is through the use of mindmaps.

Mindmapping is a great way to generate creative ideas, take notes, think through difficult problems, or organize your thoughts so that you can begin to visualize connections you may have missed before.

There are a variety of software tools for mindmapping, and you can always do it with pencil and paper (it's best if you have a variety of colored pencils or pens).

The software mindmapping tools listed here are all ones that I've used myself and have recommended to others. iMindMap is a commercial application, while the others offer both free and paid versions - (except Freemind, which is the only one that is available only in its free, open-source version).

There are also plenty of books that deal with mindmapping, thinking styles, and creativity. There's a section on "Thinking Books" in the Books, etc. area of the site.