KLicheR

Create a unique ID to easily identify repeater field’s rows. The field is fulfill on the first “save” of the post.
Compatibility
This ACF field type is compatible with:
<ul>
<li>ACF 5</li>
</ul>

Advanced Custom Fields: Unique ID Field

Create a unique ID to easily identify repeater field's rows.

samuelrajkumar

Giveaway Helper retrieves Emails and Names of the commentators of an article (especially giveaway article). You can easily select all those Emails or Names, copy them and paste them into Random.org to select winners.
Features:
<ul>
<li>Retrieves the Emails and Names uniquely. Even though there are multiple entries of same person, only 1 entry is accepted.</li>
<li>Ability to filter-out any Email Addresses you want.</li>
</ul>

Giveaway Helper

Plugin that helps you select winners through Random.org

Advanced Custom Fields: Unique ID Field vs Giveaway Helper