Keywatch is a free, OSGi-based monitoring system that provides the adaptability of a modern monitoring system without being complex or hard to configure. It support agents written in any language, and comes pre-packed with a Perl agent and a set of check scripts. Keywatch also supports Nagios check scripts.
Membrane SOAP Router is a modular SOAP intermediary written in Java. It is fully configurable due to Spring style configuration. You can audit SOAP traffic, route messages through DMZ, and gather performance statistics. The small memory consumption of less than 20 Megabytes makes it possible to run an instance of Membrane SOAP Monitor on any computer that provides or consumes Web services.
Wiseman is an implementation of the WS-Management specification for the Java SE platform. The project scope includes the WS-Management specification and its dependent specifications, which can be found at http://www.dmtf.org/standards/wbem/wsman/. The project requires Java SE 5+ or above, and is built on JAXB 2.0 and SAAJ 1.3 (part of the JAX-WS project). Ant scripts for standalone and Netbeans builds are supplied.