Mind-mapping.org has a good capability for selecting software by map type and operating system (click on the 'Refine software list' tab at the top right of its web page), and shows the price. Unfortunately, it doesn't allow you to filter on price or choose to see only the free ones. This article is therefore a quick list to current software that is free or has a free option. It excludes applications that have a time limit on their operation, for example, free trial software or web applications.
Nice brainstorming/concept mapping tool with lots of features, even in free version. Includes several templates, ability to include images, stamps, links, maps, more.
Qualitative analysis of the attitudinal surveys following the
activity provided data regarding students' preference for the Physical Webbing activity over the traditional lecture, acceptance of participatory manipulatives, perceived learning and attitudes towards collaborative kinesthetic three-dimensional Mind Mapping.