Any ideas on what software to use for planning out our story and creating mind-maps?
a little expensive.
If you’re doing one project, the web version is free to use.
Ah, that’s useful. I’ve been using twine as my map
I use XMind 6, which has a free version, pro version and business version. I’m not going to say that it’s any better than the ones already recommended (which I might myself be inclined to check out), but it’s another option you can look at. I use the free version. The one bonus it might have over the one @fantom mentioned is that you download it. I have to work offline a lot these days and can’t use my browser at those times.