People working on open source projects often solve real problems and make other people's life better, yet some of them consider themselves anti-capitalist or even socialist.
Many successful open source projects have a corporate backing to them, driving resources and energy into them.
Open source isn't anti capitalist. It's capitalism at it's best form. People join at their own free will, the rule of contracts (open source licensing) are strictly enforced, and there are lots of ways people can profit from open source.
