I'm looking to reduce the initial costs of starting a business. As much as I like Windows Server 2008 and SQL Server 2008, I think their per-processor sale model is very expensive. Plus, if the business were to grow, new web and database servers would depend on those, increasing expenses.
What are the most popular (i.e. most widely used) free-of-charge linux distrubitions for commercial businesses?
What are the most popular (i.e. most widely used) free-of-charge SQL databases for commercial businesses?