This was an EU funded project that ran from September 2004 to September 2007. Its goal was to:

to produce the technological infrastructure
necessary for the rapid prototyping and development of knowledge-
intensive distributed open services for the semantic Grid. The results aim
at developing Grid systems that optimise cross-process, cross-company and
cross-industry collaboration, which OntoGrid will show by adopting a use
case-guided development and evaluation strategy based on two test case
applications, delivering a prototype at the project’s end