Globus (http://www.globus.org/) is the world-leading open-source platform for Grid computing. It is a complete set of middleware components. Its pre-Web-Services releases, culminating in version 2.4 (properly referred to as GT2.4 or Globus Toolkit 2.4) is widely used in major projects in Europe as well as globally. The more recent Web Services version of Globus Toolkit (GT4) contains the whole of the pre-Web-Services components, for backward compatibility, thus allowing projects to evolve over time to a Web Services solution. Many projects that have installed GT4 are only using the GT2.4 compatible subset at this time, since investment in moving to Web Services is not trivial.
The company Univa delivers and supports commercial versions of Globus middleware.
http://omii-europe.org/OMII-Europe/platforms.html
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