YAML is described as 'Human-readable data serialization language. It is commonly used for configuration files and in applications where data are being stored or transmitted. YAML targets many of the same communications applications as Extensible Markup Language (XML) but has a minimal' and is a Markup Language in the development category. There are more than 10 alternatives to YAML for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and BSD apps. The best YAML alternative is Quarkdown, which is both free and Open Source. Other great apps like YAML are Markdown, JSON, KDL and XML.
The most user-friendly config format hands down!