SimpleMind+ is a free mind mapping tool that allows users to visualize ideas and brainstorming through creating and sharing maps across different operating systems like iOS and Windows. It can be used for brainstorming, mind mapping, presentations, and sharing maps by email. Users can create new maps, add child topics, save maps, view map history, change themes, and export maps to share. The app is available for download on iOS devices as well as Windows desktop computers.