To create a mind map for free, you can use online tools and applications. Some popular free mind mapping tools include "Coggle", "MindMup", "Bubbl" and "Draw io". These tools provide the ability to create and edit mind maps in a user-friendly visual interface and save them in various formats. You can also use free programs such as "FreeMind" and "XMind" which offer advanced features and capabilities for creating mind maps.