Steve Grunwell

<a href="https://codex.wordpress.org/Excerpt" rel="nofollow ugc">WordPress post excerpts</a> can be a great way to hand-craft the summary of your content. Unfortunately, writing post excerpts isn’t as nice of an experience as what you find elsewhere in WordPress. Want to include links in your excerpts, or bold some text? Hopefully you know some HTML!
Advanced Post Excerpts is designed to change that, by giving your editors an easy, intuitive interface for writing great post excerpts.
For complete details and/or to contribute to ongoing development, please <a href="https://github.com/stevegrunwell/advanced-post-excerpt" rel="nofollow ugc">visit this project on GitHub</a>.

Advanced Post Excerpt

Replace the default Post Excerpt meta box with a superior editing experience.

demetris (Demetris Kikizas)

Extra Options is a collection of WordPress tweaks to improve your publishing experience and your site’s performance.
It strives to be simple and discreet; 
everything in it is optional, it does nothing by default, does not touch your content, and uninstalls cleanly.
Extra Options offers options for the following:
<ul>
<li>Writing</li>
<li>Administration</li>
<li>Content filters control</li>
<li>Document HEAD control</li>
<li>Search Engine Optimization (all you need and nothing you don’t)</li>
<li>Loading AJAX libraries from the Google CDN</li>
<li>Plus a couple of miscellaneous tweaks</li>
</ul>
See homepage for a detailed presentation: 
<a href="http://op111.net/code/xo" title="Extra Options for WordPress [op111.net]" rel="nofollow ugc">op111.net/code/xo</a>
Please note that Extra Options is still very young and not considered stable. Your feedback is appreciated: 
<a href="http://op111.net/78" title="Extra Options v0.0.1: A plugin for WordPress [op111.net]" rel="nofollow ugc">op111.net/78</a>

Extra Options

A collection of tweaks to improve your WordPress experience and your site’s performance.

Advanced Post Excerpt vs Extra Options