KLicheR

Scan your WordPress installation for all missing attachment files, download them from another WordPress installation and resize them with your defined image sizes.
Know that the plugin will not create new media on your installation database, it’ll just use the existings entries of medias in your database to retrieve the physical files on another WordPress installation.
E.g.: http://serverA.com have an entry for the mediaX in his database. The path for the physical file is supposed to be http://serverA.com/wp-content/uploads/2013/06/mediaX.jpg but it’s not here. If you know that this same media exists on http://serverB.com + the physical file, you can use this plugin on http://serverA.com, specifying http://serverB.com in the Server URL field and the plugin will search the file here: http://serverB.com/wp-content/uploads/2013/06/mediaX.jpg. If it find it, it will be downloaded here: http://serverA.com/wp-content/uploads/2013/06/mediaX.jpg.
<h4>Do you need this?</h4>
This plugin is useful if you have multiple instances of a same project installed on multiple servers.
For example, a team of developers, each of them having a copy of the “master” installation located at the production server. Periodically, the database of the “master” installation is given to the developers who update their code through a <a href="https://en.wikipedia.org/wiki/Revision_control" rel="nofollow ugc">VCS</a> (like SVN, GIT, Mercurial). There is chance that the uploads folder is not versionned, which is good, so the plugin is useful here to download the medias from the “master” installation.
<h4>How tu use it?</h4>
In the admin, go to Tools/Import and choose the Attachment files importer. From here, enter the URL of the WordPress installation that contain the physical files of medias and click Import.
Existing files will not be overriden.
<h4>Debug</h4>
The plugin is in an early stage and bugs may occurs. If you want to show a detailled report of the importation process, add this line to your wp-config.php file:
<pre><code>define('ATTACHMENT_FILES_IMPORT_DEBUG', true);
</code></pre>

Attachment Files Importer

Scan your Wordpress installation for all missing attachment files and download them from another Wordpress installation.

Fabian

Traffic Limiter is a useful addon for blogs with many media files which can cause high data traffic. 
There are three traffic limits to avoid over traffic costs: daily, weekly and monthly limit. If one of these limits is exceeded downloads will either be redirected to a custom URL or a custom message is displayed. For images you can define a fallback icon which is displayed instead of the message. Additionally a download bandwidth can be set for registered users and guests.
Also included is a statistic system which displays the current traffic consumption and individual file stats to see which media produces the most traffic.
All files are sent to the browser by a PHP script, supporting the most HTTP headers like <code>If-Modified-Since</code> (for caching) and <code>Range</code> (for partial downloads)
If the Apache extension <code>mod_rewrite</code> is installed download links stay the same, if not links to media files are automatically redirected. It is recommended to install <code>mod_rewrite</code>, although this plugin works without this extension.
Note: If you provide lots of downloads or media files you should try my download manager <a href="https://wordpress.org/extend/plugins/wp-filebase/" title="WP-Filebase" rel="ugc">WP-Filebase</a>.

Traffic Limiter

Limits traffic and download bandwidth of media files. Additionally this plugin includes a download statistic system.

Attachment Files Importer vs Traffic Limiter