technirvana writes: How do you make money if you give your software away for free? That's the classic question asked of Open Source software vendors and the expected reply is that they charge customers for software customization and support. That's not the way it works anymore, though, according to a report published today by analyst firm The 451 Group. Titled "Open source is not a business model", the report challenges some long held beliefs about the technology business. Of course not everyone accepts the 451 Group's conclusions. Marcus Estes of open source development shop OpenSourcery contested the report's premise and says that a long tail of purists is doing serious business.