shawfactor

This plugin logs all wordpress queries in the current page request as a html comment at the end of your output.
It only does so when the get variable lh_log_queries is set. That variable has three settings. 
1. queries: this logs queries only 
2. hooks: this logs hooks only 
3. both: this logs both hooks and filters
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LH Log Queries and hooks

Decisions not options for query and hook logging

Dan-Lucian Stefancu

Mircea Tihu

Daniel Telbis

Dream Production

A fast/small debugger integrated into the WordPress Admin Bar, made for identifying the template used for displaying current page.
It was built for fast debugging old projects or other people’s work.
It adds some other potentially useful informations in the dropdown list:
<ul>
<li>the current theme (useful for child themes)</li>
<li>total queries on current page</li>
<li>execution time</li>
</ul>

DP Debug Menu

Very simple and handy plugin. Shows number of queries, too - very good! I like it!

Great!

Quickly shows the template used for current page, number of queries, and execution time for PHP code.

LH Log Queries and hooks vs DP Debug Menu