Just looked at mindmeister. Yes that is a mind mapping tool.
here is a very old blog about mind mapping I wrote, amazingly over 1,300 days ago
Mind Mapping | PM Words of Wisdom
Mind mapping is great for creative though, the key difference is that goalscape organises the elements into a 100% circle, and then you can prioritise and track agaist the goals (elements).
So it takes it from 'creative' into 'real world implementation/project'.
We tend to 'mind map' first on a whiteboard, then translate into goalscape to rationalise / prioritise and track against the goals.
(small caveat, for a project above a certain size, it is no substitute to full blown project management tools (that may be used in a full blown project management process like Prince-2), with gantt charts, critical path analysis, resource scheduling, dependency management etc, you wouldn't plan a multi-million