Clockwork - php dev tools in your browser - server-side component
The Phoronix Test Suite open-source, cross-platform automated testing/benchmarking software.
The Developer Tools Panel for WordPress
Xdebug Profiling Web Frontend in PHP
XHProf is a function-level hierarchical profiler for PHP and has a simple HTML based user interface.
Database Profiler for Laravel Web and Console Applications.
PHP Profiler & Developer Toolbar (built for Phalcon)