iNexi

This slider is easy to use, but powerful. It is designed to be responsive, and works perfectly with mobile devices. It can be automatically displayed on posts and pages, inserted by shortcode or PHP. The slides are pulled on each post from the attached images (gallery).
<h4>Features</h4>
<ul>
<li>Automatically display slider for every post and/or page</li>
<li>Slides are created from images attached to the post/page it is displayed on (WordPress Gallery)</li>
<li>Responsive slider performs the same on every platform (desktop or mobile)</li>
<li>Fade or slide effects</li>
<li>Navigation with buttons, “dots”, keyboard, scroll-wheel, automatic timer</li>
<li>Show titles and descriptions with an overlay</li>
<li>Link individual slides to any URL</li>
<li>Show a “zoom” button to integrate with a Lightbox plugin</li>
<li>Many options available through an easy to use admin interface</li>
</ul>
Please visit my homepage to submit bug reports and feature requests.
Plugin Homepage: <a href="http://inexi.com/wordpress" title="iNexi: WordPress Plugins" rel="nofollow ugc">iNexi.com</a>

Easy Gallery Slider

Responsive slider uses the images attached to a post or page. Simple to customize and configure.

MyWebsiteAdvisor

ChrisHurst

This plugin allows you to Automatically add a watermark to all images as they are uploaded to the WordPress Media Library. 
The plugin uses PNG watermark images with transparency for precise control over the appearance of the watermarks. 
This plugin also supports simple text watermarks with adjustable color, size and transparency. 
The plugin can be configured to apply ‘text and image’, ‘text only’ or ‘image only’ watermarks. 
The user friendly settings page allows for control over the appearance of your watermark. 
The watermark preview feature allows for easy testing of the plugin settings. 
The watermark size is controlled as a percentage of the target image, 50% means the watermark will be half the width of the target image.
<a href="http://MyWebsiteAdvisor.com/plugins/signature-watermark/" rel="nofollow ugc">Upgrade to Signature Watermark Ultra</a> for advanced 
watermark features including:
<ul>
<li>Manually Apply Watermarks to Images Previously Uploaded</li>
<li>Fully Adjustable Text and Image Watermark Positions</li>
<li>Adjustable JPEG Image Output Quality</li>
<li>Highest Quality Watermarks using Image Re-sampling rather than Re-sizing</li>
<li>Lifetime Priority Support and Update License</li>
</ul>
Check out the <a href="http://www.youtube.com/watch?v=pg3WvPBliM4&hd=1" rel="nofollow ugc">Signature Watermark Plugin for WordPress Video Tutorial</a>:
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/pg3WvPBliM4?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&hd=1&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Developer Website: http://MyWebsiteAdvisor.com/
Plugin Support: http://MyWebsiteAdvisor.com/support/
Plugin Page: http://MyWebsiteAdvisor.com/plugins/signature-watermark/
Compare Watermark Plugins: http://MyWebsiteAdvisor.com/tools/wordpress-plugins/watermark-plugins-for-wordpress/
Video Tutorial: http://mywebsiteadvisor.com/learning/video-tutorials/signature-watermark-tutorial/
Requirements:
<ul>
<li>PHP v5.0+</li>
<li>WordPress v3.3+</li>
<li>GD extension for PHP</li>
<li>FreeType extension for PHP</li>
</ul>
To-do:

Signature Watermark

Automatically watermark images as they are uploaded to the WordPress Media Library using Both Images and Text.

Easy Gallery Slider vs Signature Watermark