I have just created the Extra Field module out of the need for an API to quickly create extra fields. It provides a plugin type for custom field formatters and uses hook_entity_extra_field_info() to declare fields and hook_entity_view() to return the renderable output.

I like to collaborate so that the field_concat_display module can use the foundation that Extra Field provides. Extra Field does not yet provide a plugin type for field widgets, but that can be provided if need to.

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Sutharsan created an issue.