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

Brad Parbs

Outputs some database query information on page load for logged in admins. Output is located as an html comment in the footer and also in the console.

Database Performance Monitor

Outputs some database query information on page load for logged in admins. Output is located as an html comment in the footer and also in the console.

LH Log Queries and hooks vs Database Performance Monitor