Mike Jolley (a11n)

Testing your WordPress site? This plugin allows you to display memory, page load time and query count in the footer of your site on both the front-end and within admin.
This plugin is partly based upon the WP Query Counter by Steven Word (http://www.stevenword.com/plugins/wp-query-counter/) and has been customised for my testing needs.
If you’d like to contribute to the plugin you can find it on GitHub: <a href="https://github.com/mikejolley/WP-Page-Load-Stats" rel="nofollow ugc">https://github.com/mikejolley/WP-Page-Load-Stats</a>

WP Page Load Stats

Not sure why this only has 100+ users but this is a great tool!

Excellent!

Display memory, page load time, average load time and query count in the footer of your site.

Francis Smith

View your PHP error log, CPU and RAM usage, and view disk space all in one location. This is a new plugin under development. Currently it does not do terribly much, but we are constantly working on adding new and useful features.
Why use this plugin instead of the many others? ServerMonitor does not use PHP’s shell_exec, which is disabled by many web hosts for security concerns. Currently this plugin only supports Linux servers. Windows Server support is planned, but is a low priority.
For any bug reports or suggestions, let me know in the plugins support forum.

ServerMonitor

A simple plugin to view server resource usage (ram, cpu, disk), check your PHP error log, and more.

WP Page Load Stats vs ServerMonitor