A Marxist critique of free software,
Software and Market Relations argues that free software is
inhertentally anti-capitalist, and that the disagreement between
foundation and the
Open source initiative is a
disaggrement over there the relation to capitalism.
The Marxist Internet Archive (MIA) Encyclopedia of Marxism has a useful introduction to Intellectual Property.
Free as is Freedom, a biography of Richard Stallman, New Left Review has a review of it.
The World Socialist Web Site has a few articles:
Eric S. Raymond and Rishab Aiyer Ghosh both argue that free software is driven by a market in which reputation serves as money. One wonders if these people would argue that socialism is capitalism.
Indymedia uses and develops (for it's own use) free software: