The Developer Tools Panel for WordPress
The Phoronix Test Suite open-source, cross-platform automated testing/benchmarking software.
Clockwork - php dev tools integrated to your browser - server-side component
Xdebug Profiling Web Frontend in PHP
XHProf is a function-level hierarchical profiler for PHP and has a simple HTML based user interface.
a PHP client for statsd
GUI to analyze the profiling data collected using XHProf – A Hierarchical Profiler for PHP.
[NOT MAINTAINED ANYMORE] Lightweight profiler for PHP (based on facebook/xhprof) -- use Blackfire instead
Data collector package for xhgui. Enables host applications to push data into an xhgui instance