I'm a huge fan of Ayoa. I've bounced between a bunch of different task management programs and this is the only one I've stuck with for over a year. I like the task list feature where you can document anything that comes to mind and then prioritize it into "now", "next", "soon". Lot's of other planning/brainstorming tools on there, but that's the one I use most frequently.
Those by Buzan were generally quite good.
Much of it is very similar between publications so I think most would offer similar value. The first is the original publication and (from memory) perhaps gives a little more background to his concept of 'radiant' thinking than others.
Not too sure of the MindMup software but Buzan did have certain 'rules' for Mindmaps and those were - apparently - used as part of the software that he (and subsequently) his company endorsed. A quick check says it's now moved on (as has Mr Buzan himself) but can be found here: