Seerox

<p><a href="http://www.seerox.com/" rel="nofollow ugc">Seerox</a> brings another exciting plugin for you. This plugin will allow you to manage different file types in Media Library, So if you want to Enable/Disable any specific file type in media library to upload for Security reasons. Using this plugin you can control permissions for Your Site users to upload specific type of files not only from media library section but also from frontend.</p>
<h3>Features</h3>
<ul>
<li>Adds file extensions that WordPress doesn’t support by default</li>
</ul>


WP Media File Type Manager

WP Media File Type Manager will allow you to manage different file types in Media Library.

Katsushi Kawamori

<h4>Edit Mime Type</h4>
<ul>
<li>Add Mime Type</li>
<li>Remove Mime Type</li>
<li>Change File Type</li>
</ul>
<h4>Edit Users</h4>
<ul>
<li>Specify uploadable extensions for each user</li>
<li>Specify non-uploadable extensions for each user</li>
</ul>


Mime Types Plus

The UI is unclear. There are greyed-out checkboxes beside the types which are recognized by WordPress already. You can NEVER enable or disable them, so showing disabled checkboxes beside them is confusing, as it implies there's some way to enable them, but there isn't. Just LIST the built-in types, please, without implying that they can be edited. Also label them as the built-in types.
Checking a box beside something is generally considered to mean that you're enabling it. Here, checking a box means you want to delete it. Counterintuitive. Please use a red-X or minus control rather than a checkbox to mark things for deletion.
It would be VERY HELPFUL to have a built-in list of the more common unrecognized filetypes that could be enabled with one click or check, rather than having to look up the MIME type online every time. epub, mobi, and azw formats in particular.



Does the job but could be greatly improved

Add the mime type that can be used in the media library to each file type.

WP Media File Type Manager vs Mime Types Plus