MindMup is a free, open source, online mind mapping tool.
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Pro Frictionless interface
MindMup allows focusing on thoughts and productively capture them without getting in the way.
Don't need to install anything, just open the website and you are set.
Pro Just works
Pro Compatible with Google Drive and Github
Pro Easy sharing & presenting
After taking notes, it only takes seconds to share and/or prepare them for presentations.
Pro Free and open source
Con Note capacity is limited
MindMup is good for mapping out thoughts that could be summarized in bullet points, but longer notes aren't as practical for this service.
Con Unconventional note taking style
It's a mind mapping application, not a traditional text based note storage platform.