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I think the list should either be kept out of the article altogether, or it should be explicitly limited to a small number (say half a dozen) of particularly notable clustering systems, for which some strong argument can be made for their inclusion beyond ""it's a clustering system"" or even ""it's a free clustering system"". By a strong argument, I mean statements such as ""it's the most widely used free clustering system for Linux"" or the like. Anything less restrictive is just an invitation for an unencyclopedic link farm. — "