FreeTxtMind is an excellent tool for you to use to write outlines and see the connections between ideas in your outlines. You can rearrange the connections in your mind maps by simply cutting and pasting lines from your written outlines.
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.
GitMind - GitMind, a free online mind map maker for brainstorming, project planning, development, action and other creative tasks. This tool lets you share mind maps with tons of users and collaborate with them.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Xmind - Xmind is a brainstorming and mind mapping application.
Freeplane - Freeplane is a powerful and free software for building mind maps.
FreeMind - FreeMind is a premier free mind-mapping software written in Java.