Manu

This plugin lets your readers run snippets of code directly from your blog.
Simply add a class “run-this” and a lang attribute to the PRE tag surrounding the code. 
The lang attribute should have one of the following values : ada, assembler, awk, bash, bc, brainf**k, c, csharp, cpp, c99, clips, clojure, cobol, clisp, d, erlang, forth, fortran, go, haskell, icon, intercal, java, rhino, javascript, lua, nemerle, nice, ocaml, pascal, perl, php, pike, prolog, python, python3, r, ruby, scala, scheme, smalltalk, tcl, unlambda, vbasic, whitespace
The code is sent over to <a href="http://ideone.com/" rel="nofollow ugc">Ideone</a> to run; results (output, time and language implementation details) are displayed on your blog, in a table underneath the code.
This plugin is free software released under the GNU General Public License.
<h3>Release Notes</h3>
<ul>
<li>
This plugin depends on the <a href="https://wordpress.org/extend/plugins/wp-syntax/" rel="ugc">WP-Syntax plugin</a> being installed and activated.
</li>
<li>
This plugin uses CORS to send the code source accross to a different domain, recent browsers should work fine (See <a href="http://en.wikipedia.org/wiki/Cross-origin_resource_sharing#Browser_support" rel="nofollow ugc">Browser support</a>)
</li>
<li>
This plugin uses jQuery, which is also included in the plugin archive
</li>
<li>
This plugin relies on Ideone web services API (http://ideone.com/api)
</li>
<li>
This is an alpha release, please send bug reports to runthis.plugin@gmail.com
</li>
</ul>

Run This!

This plugin lets your readers run snippets of code directly from your blog.

pantsonhead

Admin’s Debug Tool allows administrators to analyze page execution without executing/displaying for non-admin users. 
This can be useful when trying to track slow queries or badly performing plugins or widgets. 
The admin-only nature of this plugin can also be useful when trying to track issues that only occur on production servers.

Admin's Debug Tool

Admin-only tool for checking execution times and error output of current theme/plugins

Run This! vs Admin's Debug Tool