by danielpataki on WordPress.org
A field for Advanced Custom Fields which allows you to create a field where users can select terms or taxonommies flexibly.

ACF control for field creation
A more advanced taxonomy selector for ACF. You can create a taxonomy or a term selector and restrict each based on post type or taxonomy. You can also allow for null and determine the return format.
This ACF field type is compatible with both ACF 4 and ACF 5.