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Hmm it doesn't really count but JBoss is open source and has paid developers. jQuery UI is maintained by a consulting group. Firefox's core developers are paid. I'm pretty sure there are paid contributors on Hadoop and Lucene.

And lets not forget Rails....

Perhaps less well known are open-source reporting companies like Actuate (sponsors/main developers of the top-level Eclipse BIRT project), Pentaho, JasperSoft. Not sure about revenue models for others, but Actuate sells support for their open-source tools and offers proprietary add-ons for those that need to scale their deployments.

37 signals doesn't get paid specifically for rails though. If 37 signals went away, rails wouldn't. Not without a huge fuss anyway.

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