Nick Halsey

This plugin creates a fullscreen slideshow that displays randomly-selected pictures from your media library. Designed to display pictures related to your business/organization in the background at an event or in your office, there is no need to configure any settings or controls. Image captions/descriptions are automatically displayed as well, and can be configured based on your needs.
Once activated, you can view the slideshow by visiting <code>http://yourdomain.com/slideshow</code>. All JPEG images will be displayed (since .jpg is best for pictures, while .png and .gif are typically used for graphics).
Please note that it is not currently possible to pause the slideshow or go back; the slideshow is not designed for personal viewing. However, clicking/tapping on the image will open its attachment page in a new tab, allowing images to be contextualized or edited easily.
The slideshow can also be embedded into your site via a widget or a shortcode.
You can control some options by adjusting the url of the slideshow. Parameters are controlled via query string (and widget options and shortcode attributes).
<ul>
<li><code>size</code> is the size of the image to load, either <code>thumbnail</code> (discouraged), <code>medium</code>, <code>large</code>, <code>full</code>, or <code>auto</code>, which uses medium or large depending on <code>wp_is_mobile()</code>.</li>
<li><code>year</code> is the 4-digit numeric year in which the images were published.</li>
<li><code>month</code> is the numeric month in which the images were published (between 1 and 12), typically but not necessarily used in conjunction with <code>year</code>.</li>
<li><code>mode</code> defines a subset of images to use, such as <code>featured</code> for featured images only.</li>
<li><code>captions</code> controls the captions display: either <code>auto</code>, <code>none</code>, <code>title</code>, <code>titlecaption</code>, <code>caption</code>, or <code>description</code>. Caption data is read from the image attachment post and can be updated in the media library.</li>
</ul>
Using all options, for example: 
http://example.com/slideshow?size=full&year=2014&month=4&mode=featured&captions=titlecaption
You can see it in action <a href="http://uscasce.com/slideshow" rel="nofollow ugc">here</a>.

Content Slideshow

This plugin creates a fullscreen slideshow that displays randomly-selected pictures from your media library. Designed to display pictures related to y …

sverde1

This plugin allows you to watermark your uploaded images. You can create watermark with different fonts, colors and 
apply those watermarks to different image sizes (thumbnail, medium, large, fullsize). You can also position the watermark 
anywhere on the image within Watermark RELOADED settings. Watermarking settings are simple to use and provide you with 
instant preview of how your watermark will look like on the uploaded image.
<a href="http://eappz.eu/en/products/watermark-reloaded-pro/" rel="nofollow ugc">Upgrade to Watermark RELOADED Pro</a> for more 
watermarking features:
<ul>
<li>watermark opacity</li>
<li>image watermark</li>
<li>watermark background color</li>
<li>text watermark with outline</li>
<li>text watermark with variables</li>
<li>upload time option to turn off the watermarking</li>
<li>many more amazing features</li>
</ul>
Requirements:
<ul>
<li>PHP5</li>
<li>GD extension for PHP</li>
<li>FreeType Library</li>
</ul>
To-do:
<ul>
<li>Watermark RELOADED Bug fixing (request by: all)</li>
<li>Don’t display watermark on images where watermark would overflow image (request by: alex)</li>
<li>Watermark aditional image sizes added by other plugins (request by: twincascos)</li>
<li>Watermark images that were uploaded before plugin was installed (request by: anchy-9, Blogging Junction, Ashkir, Mobile Ground, Nicolas)</li>
<li>Image size aware watermark (request by: brohism)</li>
<li>Watermark outside picture</li>
</ul>

Watermark RELOADED

Add watermark to your uploaded images and customize your watermark appearance on a user friendly settings page.

Content Slideshow vs Watermark RELOADED