Freeplane - Freeplane is a powerful and free software for building mind maps.
VideoScribe - Make your own whiteboard video animations with Sparkol VideoScribe – award-winning video scribing app for PC, Mac and iPad. Free trial available.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
GoAnimate - Make your own animation quickly and economically with GoAnimate. Reach prospects and customers with animated videos online about your business and products.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.