Denis

Allows your users to add posts with images by anonymous, without any registration and authorization. 
From any page of your blog, where you place the form.
<ul>
<li>You can disable image upload option at plugin options page.</li>
<li>You can set your own template for generating post. Simply from options page.</li>
</ul>
<h3>Thanks</h3>
Uses <a href="http://blueimp.github.io/jQuery-File-Upload/" title="jQuery File Upload" rel="nofollow ugc">jQuery File Upload</a> by Sebastian Tschan for image transfer.

Azz Anonim Posting

Allows your users to add posts with images by anonymous, without any registration and authorization.

Dion Hulse

This plugin offers limited support. Please do not expect new features or too many bugfixes. Features may be removed at any time.
Add From Server is designed to help ease the pain of bad web hosts, allowing you to upload files via FTP or SSH and later import them into WordPress.
This plugin is NOT designed to.. 
 * Be used as a replacement for the file uploader 
 * Be used for migration of websites 
 * Re-import your files after moving webhosting 
 * Batch import media
This plugins IS designed to.. 
 * Import files which are larger than your hosting allows to be uploaded. 
 * Import files which are too large for your internet connections upload speed.
WordPress does a better job of file uploads than this plugin, so please consider your needs before you use it.
You may also want to look at using WP-CLI for media import purposes: 
https://developer.wordpress.org/cli/commands/media/import/

Add From Server

Whenever I need to upload media files that are too big to upload directly to WordPress, I FTP them to the server and use this plugin to add them.

Great tool for those big media files you can only ftp to the server

Add From Server is designed to help ease the pain of bad web hosts, allowing you to upload files via FTP or SSH and later import them into WordPress.

Azz Anonim Posting vs Add From Server