[ubuntu] Tree-like Note/Journal Application

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http://ubuntuforums.org – Hello: I keep technical journals. I use Google Docs. I have tried Evernote but never feels compeling to use. I took a quick look at basket notes (KDE) and does not seem to fit the bill either. So for now I will stick with Google Docs. However, what I would really like is a note taking/journal application that lets me create trees. Much like an outline, but with more graphic support and navigation. I will elaborate. To me, organizing a project or writing something inevitably leads to a hierarchic with tasks and sub tasks. covering a subject involves the topics and subtopics, (Hardware)