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"It seems to me that attempting to find a "free" (as in beer) Enterprise Linux is kind of silly. What makes it "enterprise" is more the support contracts and bug fix agreements than the actual product. Sure there are admin tools and the like, but it comes down to who is going to come and fix your server when it goes down at 2am, and that is a person you have to pay for, not a bit of code."
Maybe for the server you run your business on ... but do you also want to pay $2500 a year for your developement server too?
Why not use a CentOS or WhiteBox Linux machine for testing code and in predeployement scenarios?
For people deploying 1000 seats of RHEL 3 WS or 50 RHEL ES boxes, the cost savings is substantial.