Apple is giving away free evaluation copies of Snow Leopard Server to those who qualify. Apple does have some limitations on who qualifies.
This offer is limited to corporations, small businesses, nonprofit organizations, government agencies, and educational institutions located in the United States. Resellers do not qualify and are not eligible to participate in this offer. Students do not qualify and are not eligible to participate in this offer. Persons under the age of 13 and all other persons under the age of majority are not eligible and do not qualify for this offer.
This version should not be used in production environments and cannot be resold.