XMind ZEN is a mind-mapping tool based off of the same open-source project as XMind Pro. It supports the same map structures and 100% compatible with XMind 8. It has new themes, some with more muted tones for a more modern look and feel. Its distinct feature is the "ZEN Mode" that will automatically hide extra panels allowing you to focus on your thoughts and adding to your document without distractions.
The posted price is for a 6-month license to the current version of XMind Zen. You can find more pricing information here.