Zero dependency persistence. Different persistence strategies are included so you can choose based on your specific needs. If you need human-readable, hand-editable persistence JSON is a good candidate. If you need ultra high performance persistence then the binary route is the way to go.
JSON library that includes support for polymorphic data structures and reference tracking. For more information, see the README.
JSON-like format with most of the same features as the JSON library but is designed to be human readable and easy to hand-edit.
Crazy efficient binary file formats. Requires a bit more work than JSON, but if performance is important (such as runtime state persistence) this is the way to go. For more information, see the README.