Mikoviny

This plugin is saving pictures used in the posts from other sites (ctr+c & ctr+v) to own server and add to media library.
<h4>How to use this plugin</h4>
<ul>
<li>Just copy paste picture to post/page from other web page. By saving post/page all used pictures from other web pages download and save to your own server. Pictures are automatic added to media library. There are no setting by this plugin.</li>
<li>Now I noticed that pictures are adding twice and don?t know if it?s bug or some collision with other plugin… and have no time for now… 🙁</li>
</ul>

WP Photo Downloader

This plugin is saving pictures used in the posts from other sites (ctr+c & ctr+v) to own server and add to media library.

Willy Bahuaud

This plugin add a metabox which allox to upload and link multiple images to one post. 
Pictures are linked by the way of meta_value (and attachments ID). They can be reordered using drag and drop.
Number of allowed pictures and concerned post types can be overited using hooks.
Plugin includes many functions to retrieve linked pictures. 
For more information on using the plugin, refer to the section <a href="/extend/plugins/multi-image-metabox/other_notes/" rel="nofollow ugc">“Other Notes”</a>.
<h3>Set concerned post types</h3>
Paste this into your theme’s functions.php file :
 
<h3>Set allowed number of picts</h3>
Paste this into your theme’s functions.php file : 
 ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ); 
 return $picts; 
 } 
 ?>
<h4>Set allowed number of picts, depending to the post_type</h4>
Paste this into your theme’s functions.php file : 
 add_filter(‘list_images’,’my_list_images’,10,2); 
 function my_list_images($list_images, $cpt){ 
 global $typenow; 
 if($typenow == “my_custom_post_type” || $cpt == “my_custom_post_type”) 
 $picts = array( 
 ‘image1’ => ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ‘image3’ => ‘_image3’, 
 ); 
 else 
 $picts = array( 
 ‘image1’ => ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ‘image3’ => ‘_image3’, 
 ‘image4’ => ‘_image4’, 
 ‘image5’ => ‘_image5’, 
 ‘image6’ => ‘_image6’, 
 ‘image7’ => ‘_image7’, 
 ‘image8’ => ‘_image8’, 
 ); 
 return $picts; 
 }
<h3>get_images_ids()</h3>
This function have to be used into a template file, or any function. 
It return an array of the linked attachments’s ID.
It take two arguments whose are :
<ol>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 45, 
 ‘image1’ => 5, 
 ‘image2’ => 6, 
 ‘image3’ => 12, 
 ‘image6’ => 20, 
 ‘image7’ => 15 
);
//Empty pictures ar not returned
?>
<h3>get_images_src()</h3>
This function have to be used into a template file, or any function. 
It return an array of URIs and dimension for the linked attachments’s, by order.
</li>
</ol>
It take three agruments whose are :
<ol>
<li>size (string) the size to return</li>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 array( 
 [0] => ‘http://url_of_the_medium_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 ‘image2’ => array( 
 [0] => ‘http://url_of_the_medium_second_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ) 
);
?>
<h3>get_multi_images_src()</h3>
Same as get_image_src(), but return two sizes for all the pictures.
</li>
</ol>
It take for agruments whose are :
<ol>
<li>size (string) the size to return</li>
<li>size2 (string) another size to return</li>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 array( 
 [0] => array( 
 [0] => ‘http://url_of_the_medium_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 [1] => array( 
 [0] => ‘http://url_of_the_full_pict.jpg’, 
 [1] => 1020, 
 [2] => 600, 
 [3] => false //I’ve no idea what is it… 
 ), 
 ), 
 ‘image2’ => array( 
 [0] => array( 
 [0] => ‘http://url_of_the_medium_second_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 [1] => array( 
 [0] => ‘http://url_of_the_second_full_pict.jpg’, 
 [1] => 1020, 
 [2] => 600, 
 [3] => false //I’ve no idea what is it… 
 ) 
 ) 
); 
//Empty pictures ar not returned
?></li>
</ol>

Multi Image Metabox

Add a multi-image metabox to your posts, pages and custom post types

WP Photo Downloader vs Multi Image Metabox