PSI Probe is a community-driven fork of Lambda Probe distributed under the same open-source license (GPLv2). It is intended to replace and extend Tomcat Manager, making it easier to manage and monitor an instance of Apache Tomcat.

Unlike many other server monitoring tools, PSI Probe does not require any changes to your existing apps. It provides all of its features through a web-accessible interface that becomes available simply by deploying it to your server.