YAML is described as '1.2' and is an app in the Development category. There are six alternatives to YAML for a variety of platforms, including Windows, Linux, Mac, BSD and Self-Hosted solutions. The best alternative is JSON, which is free. Other great apps like YAML are TOML (Free, Open Source), XML (Free), MessagePack (Free, Open Source) and Protocol Buffers (Free, Open Source).
TOML aims to be a minimal configuration file format that's easy to read due to obvious semantics. TOML is designed to map unambiguously to a hash table. TOML should be easy to parse into data structures in a wide variety of languages.
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TOML vs YAML opinions
pros, cons and recent comments
The most user-friendly config format hands down!