jeremyHixon

Gives theme developers and their users a convenient dropdown menu to preview the themes currently installed on the site as well as providing a download link for the one currently selected.
There is an options page in the admin section that allows you to:
<ul>
<li>Choose which themes are available in the select menu</li>
<li>Change the label text for the select menu</li>
<li>Enable/disabled the <a href="https://wordpress.org/plugins/easy-digital-downloads/" rel="ugc">Easy Digital Downloads</a> support.</li>
<li>Enable/disabled the bar globally. If disabled globally, enable on pages/posts.</li>
<li>Enable and disable the default stylesheet</li>
<li>Add custom content to the bar</li>
</ul>

Rational Theme Server

Plugin for theme developers to preview and serve downloads of their themes.

Frank Corso

Terrence Gonsalves

Developer Toolkit for WordPress is a handy tool for WordPress Developers. This plugin gives you 6 new shortcodes for displaying your WordPress plugins that are stored in the repository. 
Once you add your plugins, you will have 6 shortcodes:
<ul>
<li>Display Plugin Description</li>
<li>Display Plugin Download Count</li>
<li>Display Plugin Version</li>
<li>Display Plugin Average Rating</li>
<li>Display Date Of Last Update</li>
<li>Display Link To Plugin File</li>
</ul>
All of this is synced to your plugin on the repository on a regular basic. So when you update your plugin, your shortcodes will automatically update.
You also get a statistics page in the admin panel. The statistics page shows:
<ul>
<li>Number Of Plugins You Have Entered</li>
<li>Total Downloads Of All Plugins</li>
<li>Overall Average Rating Of All Plugins</li>
<li>Overall Average Downloads Per Plugin</li>
</ul>
<h4>Make Suggestions Or Contribute</h4>
Developer Toolkit for WordPress is on <a href="https://github.com/terrence-gonsalves/wordpress-developer-toolkit" rel="nofollow ugc">GitHub</a>! I have plenty of items on my to-do list for this plugin. I would love to hear your feedback so feel free to open issues or comment on any existing ones. Feel free to fork and open pull requests!

Rational Theme Server vs Developer Toolkit for WordPress