microkid

This generates meta descriptions for your posts automatically, using the format explained on the Official Google Webmaster Central blog in <a href="http://googlewebmastercentral.blogspot.com/2007/09/improve-snippets-with-meta-description.html" title="Improve Snippets With Meta Descriptions" rel="nofollow ugc">this article</a>. It uses author, post date, categories, number of comments and, when available, tags.
<h3>Compatibility</h3>
Although this plugin is still in BETA it should work with these other plugins:
<ul>
<li>Ultimate Tag Warrior – If you are using WP 2.3+ with native tag support my plugin will use those tags, if you have a lower version and UTW installed it will use those.</li>
<li>All in One SEO Pack – Make sure you switch of the “Autogenerate descriptions” option for this plugin or you will have two meta descriptions in your page, which can’t be good!</li>
<li>TDO Mini Forms – My plugin will grab the author of the article when it’s been submitted through this plugin.</li>
</ul>

Improved Meta Description Snippets

This generates meta descriptions as advised by the Official Google Webmaster Central blog.

dessky

This is a lightweight and simple plugin that gives you the ability to easily add your custom PHP code from WordPress admin.
No need for editing functions.php file any more, you can easily add new PHP code with this plugin.
It’s really useful in case of any theme update, because your custom PHP code will never be overwritten even if you upgrade or switch your theme.
This plugin was developed by <a href="https://dessky.com/" rel="nofollow ugc">Dessky Team</a>.
Dessky Team does not provide support for the Dessky Snippets on the WordPress.org forums. In order to get support or make a suggestion from a Dessky Team you will have to Join Our Open Community and <a href="https://discuss.dessky.org/t/dessky-snippets" rel="nofollow ugc">Start a Discussion</a>.
<a href="https://discuss.dessky.org/t/dessky-snippets" rel="nofollow ugc">DISCUSS WITH THE DESSKY TEAM</a>
<a href="https://discuss.dessky.org/t/dessky-snippets" rel="nofollow ugc">JOIN OUR OPEN COMMUNITY</a>: The purpose of this open community is to have a collective place where the community can help each other, and we can get some feedback to improve Dessky Snippets as well. Joining the community is also a great way to connect with like-minded people and share your experience.
You can also <a href="https://dessky.me/" rel="nofollow ugc">GET THE PREMIUM SUPPORT</a>
<a href="https://dessky.org/" rel="nofollow ugc">User Documentation</a>: Although Dessky Snippets is already easy to set up, we’ve put together tutorials, guides, and some knowledge bases to help you set up and get started with it.
I have further questions, how do I contact you?
Please fill up the <a href="https://dessky.com/contact/" rel="nofollow ugc">contact form</a> and we would be more than happy to assist.
<h4>Features</h4>
<ul>
<li>Validate the entered code for fatal errors (basic validation)</li>
<li>Checkbox for disabling the custom functions</li>
<li>Syntax highlighting (by CodeMirror)</li>
<li>Line numbers</li>
</ul>
<h4>Credits</h4>
<a href="https://codemirror.net/" rel="nofollow ugc">CodeMirror</a> is an open-source project shared under the <a href="https://codemirror.net/LICENSE" rel="nofollow ugc">MIT license</a>.
Dessky Snippets is based on the ‘My Custom Functions’ plugin developed by <a href="https://profiles.wordpress.org/arthur-gareginyan/" rel="nofollow ugc">Arthur Gareginyan</a>.
Scissors graphic is made by <a href="http://www.flaticon.com/authors/appzgear" rel="nofollow ugc">Appzgear</a> and it is licensed under <a href="http://creativecommons.org/licenses/by/3.0/" rel="nofollow ugc">Creative Commons BY 3.0</a>.
Code graphic is made by <a href="http://www.freepik.com" rel="nofollow ugc">Freepik</a> and it is licensed under <a href="http://creativecommons.org/licenses/by/3.0/" rel="nofollow ugc">Creative Commons BY 3.0</a>.

Dessky Snippets

Add your custom PHP code snippet from WordPress admin.

Improved Meta Description Snippets vs Dessky Snippets