Encrypted Notepad - Encrypted Notepad is a very simple to use application providing state of the art...

Xmind - Xmind is a brainstorming and mind mapping application.

CryptoTE - CryptoTE is a text editor with integrated strong cryptography.

MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.

Paranoia Text Encryption - Paranoia Text Encryption encrypts text according to a choice of strong algorithms.

MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.