Extend the structure of the site by way of content models, data storage, field types, and navigation, so it is more understandable to users.
Programmatically create, update, delete and deploy content with simply JSON and custom Drush commands.
A collection of field formatters which add classes to various elements (as opposed to the wrapper markup).
Layout Kit is a ready to use set of layouts, now (take a look at screenshots):
Placeholder for a visualization library agnostic field formatter for OpenAPI files.