MySQL log analyzer and profiler. Extracts the most popular queries grouping them by their normalized form and shows the statistics for each group. Helps developers to recognize most frequently run queries to be able to optimize overall db performance.
An implementation of the Open Group's Application Response Measurement (ARM) Version 4 standard. The ARM standard describes a means of breaking an application down into it's constituent transactions, and measuring response time across multiple tiers.
Monitors webpages for changes and emails output with differences to subscribers. Permits user accounts and registration. PHP/MYSQL.
ViennaProfiler allows to compare execution times of full programs or parts of a program. Execution times are stored in a MySQL database and conveniently analyzed via a web-interface. A C++ client API is provided, other languages can also be used.
log4js has moved to Github: http://stritti.github.io/log4js.
simpleWSMonitor will keep track of some values that nearly determine the availability of your webservers. It may help you find some bottlenecks from the server to your visitor and it's very lightweight, it doesn't even need a cron to work.
This debugger for PHP gives you the ability to inspect and understand what is going on in your application.
XDebug profiles viewer
This is a GUI tool for viewing an analyzing files in a Callgrind Format, generated by Xdebug Profiler ( http://xdebug.org/docs/profiler ) version 2.1.3 and higher. Java JRE 6+ required.