LEMMing stands for Linux Enterprise Management and Monitoring. It's an environment that aims an easy way to take care of your HPC cluster. It is based WebServices. That lets you LEMMing multiple clusters throght the same interface.
ActiveGrid is an Enterprise Web 2.0 solution that allows the composition of code-free applications that comply with corporate IT standards. Technologies include Python, Java, XForm, Xpath, WSDL, CSS, XML Schema (XSD), XACML, and BPEL.