YAML - YAML 1.2 --- YAML: YAML Ain't Markup Language
Protobuf - Protocol buffers are a language-neutral, platform-neutral extensible mechanism for serializing structured data.
TOML - TOML - Tom's Obvious, Minimal Language
Apache Thrift - An interface definition language and communication protocol for creating cross-language services.
JSON - (JavaScript Object Notation) is a lightweight data-interchange format
Messagepack - An efficient binary serialization format.