Kaspars

Metronet AS

Plugin adds a meta box to every post, page and custom post type where users with editor capabilities can promote other users (with author or contributor capabilities, by default) as editors of that post.
Plugin provides the following filters:
<ul>
<li><code>custom_editors_enable_roles</code> — Specify an array of user roles which should be allowed to be promoted as editors of specific posts and pages. The default is: <code>array( 'contributor', 'author' )</code>.</li>
</ul>
A plugin by <a href="http://metronet.no" rel="nofollow ugc">Metronet</a>.

Multiple Editors

Allow multiple editors and contributors per post or page. Also enable contributors and authors to upload files and add new pages by default.

Ryo Uozumi

This plugin allows contributors to upload images, and also allows only administrators to see images uploaded by others.
Contributors can only manage their own images.

True Contributor Uploads Display Administrator

This Plugin is only the administrator to be able to see the images uploaded by others.

Multiple Editors vs True Contributor Uploads Display Administrator