I agree with others here that focusing your eyes on _using_ open source is, at least, an incomplete view of the problem. What we (European software engineers) have been arguing, is that software that is funded by public means, such as from universities or institutions, ought to be made fully public, including ability to tweak. Thinking that open source software will help solve your budget and/or political problem is…
What fraction of global software spending does the EU command?
I love the vision. I'm just sceptical of how seriously it's being pursued if it's another Brussels project without resource commitments.