babo2015

This plugin adds a new “Plugins” tab to the site edit screen where you can enable or disable plugins for this website. You may enable/disable one at a time or per bulk action. The site admin will only see plugins that are enabled for his site or for the entire network. He still can decide if he wants to activate it or not.
Finally you’ll be able to install plugins that do not show to every single website in your multisite network!
<h3>Enable/Disable plugins for selected sites</h3>
<ol>
<li>Visit Network Admin > Sites and click on the Edit link of one site.</li>
<li>Select the Plugins tab.</li>
<li>Click on the Enable/Disable link beneath each plugin name to enable/disable it for this site or</li>
<li>Select several plugins by checking the corresponding check boxes or all plugins by checking the checkbox in the table header an choose Enable or Disable form the Bulk actions dropdown menu. Then click Apply.</li>
</ol>
You cannot disable a plugin for a site as long as it is activated there.

Multisite Plugin Controller

Enable plugins for selected blogs only on multisite websites (similar to theme functionality)

Sybre Waaijer

Pro Mime Types adds a nifty (network) admin interface for allowing or blocking many file extensions for uploading media, documents, and other attachments.
It also shows you a list of all allowed MIME types on the site or network.
<ul>
<li>When a MIME type is allowed, users who can upload files can now do so for that MIME type.</li>
<li>When a MIME type is blocked, users see an error that the file isn’t allowed for security reasons.</li>
</ul>
For WordPress Multisite networks, you can enable this plugin in network mode to control MIME types for the entire network.
<h3>Features</h3>
<ul>
<li>You can control many MIME types and extensions for upload via a modern interface.</li>
<li>Pro Mime Types comes preconfigured by enabling many safe MIME types.</li>
<li>View all allowed MIME types for the site (also those enabled by other plugins).</li>
<li>Every MIME type comes with a security summary explaining why you should or shouldn’t allow it. To view the summary, hover the mouse cursor over the big colored icon.</li>
<li>Accessibility is at the forefront. For example, you can use full keyboard navigation, even for tooltips.</li>
<li>Adds text, code, and miscellaneous file types to the Media Library for sorting.</li>
<li>The Media Library gains support for more file types for sorting images, audio, video, documents, spreadsheets, and archives.</li>
</ul>
<h3>Multisite support</h3>
This plugin can run in network mode, where all sites are allowed one set of MIME types. You can configure the allowed MIME types via the network administration UI.
Alternatively, Pro Mime Types can run in single-site mode, where every subsite has custom-allowed MIME types. Only the network administrator can assign these on a per-site basis.

Pro Mime Types – Manage file media types

Pro Mime Types adds a nifty admin interface for allowing or blocking many file extensions for uploading media, documents, and other attachments.

Multisite Plugin Controller vs Pro Mime Types – Manage file media types