Eno is described as 'The eno notation language is a plain-text data format designed for file-based content'. There are six alternatives to Eno 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 Eno are YAML (Free, Open Source), TOML (Free, Open Source), XML (Free) 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.