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CUBA is a small framework for the development of component-based systems which can be run as EJB applications, AXIS web services or stand-alone J2SE programs. The component and programming model is similar to EJB session beans.
The XPS is a scalable platform for meta-programming and domain engineering. It provides a virtual machine, compiler, and runtime library that make it possible to efficiently develop, debug, and run programs based on XPL (eXtensible Programming Language)