I don't think you'll find many libertarians who say people couldn't share property in a community - only that it must be the choice of each individual¹. Which is how open source works - each person decides what to open source, and many even take from open source to create their own proprietary products.

I think the question as a whole doesn't really make sense, since "open source" can't be separated from the whole economies in which it is created.

(¹ communists would object that the choice is often illusory or even non-existent, but that's another issue)