derekheld

Personal Library allows you to restrict users to seeing their own media uploads. The plugin works by filtering all requests for attachments.
<ul>
<li>Administrators will always see all attachments</li>
<li>Enable or disable access to all uploads for the following roles: contributor, author, editor.</li>
</ul>

Personal Library

Restricts users to managing/using their own attachments only.

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

Personal Library vs Giveaway Helper