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.
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.
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.
Process Monitor uses web interface to view system active process and its resource usage. Support multiple host process monitoring. This to allow developer view their active process and Administrator keep tab on system performances.