Scott (@scottsweb)

mobble provides mobile related conditional functions for your site. e.g. <a href="https://wordpress.org/extend/plugins/mobble/faq/" title="More examples" rel="ugc">is_iphone(), is_mobile() and is_tablet()</a>.
CSS media queries are great for creating responsive web designs but they do not always provide enough control. There are times when not all of the content, JavaScript or CSS on a page is relevant for a particular device. With the mobble functions you can make these kind of tweaks to your theme.
mobble can also add device information to the body class of your theme allowing you to easily target your CSS for different gadgets.
<a href="http://scott.ee/" title="Freelance WordPress web design Farnham, Surrey" rel="nofollow ugc">a plugin by Scott Evans</a>

mobble

Plugin is very simple and works very well. Great example of the plugin that does one job and does it well. Very appreciated!

Great plugin

Helper plugin that provides conditional functions for detecting a variety of mobile devices & tablets. Perfect accompaniment to CSS Media Queries.

Eugen Bobrowski

This is tool that help developers and administrators easier getting information.
The debug bar is available on front side for everyone if WP_DEBUG is true. If you are admin you can open bar on any page. Hover the mouse cursor to bottom right corner and click on
<h4>Features:</h4>
<ul>
<li>Implementation time counter</li>
<li>Queries counter</li>
<li>Queries list (sortable)</li>
<li>Memory counter</li>
<li>Segment checker</li>
<li>Cron jobs information</li>
<li>WP_Cache counter</li>
<li>phpinfo() window</li>
<li>References menu</li>
<li>Image Puller that provide pull missed images from production to develop site</li>
</ul>
Implementation time counter
It count the time from plugin loaded action to debug bar. 
It does not consider processes that implement before and during the plugins are loading.
Queries counter
It count all what is queried via $wpdb object.
Queries list
It show all what is queried via $wpdb object.
The <code>SAVEQUERIES</code> constant must be defined as <code>true</code>.
Memory counter
Returns the amount of memory, in bytes, that’s currently being allocated to your PHP script.
Segment checker
Also you can check any segment of your code.
<pre><code>do_action('check_segment', 'segment_1');

//do somethisng

do_action('check_segment', 'segment_1');
</code></pre>
The code below returns in debug bar new item like this:
<blockquote>
segment_1: 14.14/3/1
</blockquote>
The digits there ara time, queries and how many times this code was implemented.
References menu
The default one item of this menu is Errors. It shows notices and warnings including case when <code>WP_DEBUG</code> is false.
And also you can easy add your item to this menu and print there any var_dump or anything else.
<pre><code>add_filter('wp_debug_refs', 'my_debug_tool_ref');

function my_debug_tool_ref ($refs) {

 global $post;

 $refs['my_ref_id'] = array(
 'title' => 'My ref',
 'content' => 'My ref' . var_export($post, true),
 );
 return $refs;
}
</code></pre>

Debug Tool

Show helpful debug bar at front and admin side. Tool for developers.

mobble vs Debug Tool