Mindomo lets you create mind maps on your Android device.

If you like to map out your thoughts into a logical mind map format, you'll find the Mindomo app extremely useful. You can start with a basic idea in a single central node, and then take that idea in as many different directions you want using Mindomo's branching feature. The app is also highly customizable, offering different background colors, node colors, and branch designs. You can also change your text size and font, as well as insert a variety of different icons. If you're a student, entrepreneur, or just someone who needs to organize their thoughts, Mindomo is a great app to try.