Some tools that deal with configuration in code outside CINC.io:
The CINC module provides a code-friendly interface for Drupal 7 configuration.
Contentful's API defines a JSON structure for content types.
Intake.Center exports and imports content and user configuration in a JSON format.
Merlin is a Drupal 8 module that generates PHP configuration (for the Features module), as well as Behat tests, from a configuration spreadsheet.
Tooling parses Drupal menu YAML files and builds an image of a site's menu tree.