log4js has moved to Github: http://stritti.github.io/log4js.
A collection of performance analysis software that can assist with a variety of techniques useful for application software optimization and benchmarking. The current release provides support for analysis with hardware performance counters on Linux.
iEmendo allows a PHP application to seamlessly report errors and/or exceptions to a remote server by utilising PHP's custome error handlers. The iEmendo website provides a Web 2.0 type interface with an AJAX based console to view log updates in realtime