Sescle will automatically remove PHP session files if they have not been modified for longer than the 'garbage collection timeout'. This can help aleviate high-load situations where PHP itself cannot be relied on to remove expired sessions, or in a high-security environment where sessions containing sensitive data must be removed in a timely fashion. It requires Linux >=2.6.13 and Glibc >=2.4.
xseg (eXtented SErver Grapher) is a server monitoring tool. It can check whether your server's services are alive. Its output is written to an HTML file. xseg can check the services on both local and remote machines. xseg can also run user-defined shell commands and write the stdout of these commands to an output file. This makes xseg very flexible, since you can write your own shell scripts and xseg will run them and capture their output.
WildCAT is a Java toolkit and framework which can be used to build context-aware applications. From the client application's point of view, it provides a simple and dynamic data-model to represent the execution context of the application (for example, software and hardware resources), and offers a simple API for the programmers to access this information both synchronously and asynchronously (pull and push). Internally, it is a framework to integrate multiple sources of structured or unstructured monitoring data in a common data model.