Popular brainstorming and mind mapping tool,Eclipse Community Award 2008 winner,often used for capture ideas,knowledge/project management and GTD,supporting fishbones/org-charts/tree charts/spreadsheets,compatible with Freemind/Mindmanager,easy-to-use.

http://www.xmind.net

XMind 3 & 6: https://sourceforge.net/projects/xmind3/files/