Custom Metaboxes and Fields (CMB) will create metaboxes and forms with custom fields that will blow your mind. This is version 2.0 and has been completely rewritten.

Puts all ACF fields from posts, pages, custom post types, attachments and taxonomy terms, into the WP-API output under the 'acf' key

An set of form fields to make it easier to accept semi-structured data and map it directly to your own Django Models and Forms

Tracking dirty fields on a Django model

Sweet Fields Farm