Well, quite a free software implementation can not be, because often account for the costs of services and the working hours of the affected employees the lion's share of the cost. But Microsoft offers SharePoint Services with the opportunity to use the SharePoint technology without additional license costs and be established in Web 2.0 technologies in-house.
------ ----- Update 19/1/2010
In SharePoint 2010, SharePoint Services will be available without additional licensing costs. They are called now "Share Point Foundation" and are more powerful than the WSS 3.0. Further information here .
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If you think that is something SharePoint Services for hobbyists or small private websites, are mistaken. In fact, much of the functionality that are under the SharePoint server is licensed to be expensive, the little brother SharePoint Services already exists. The key benefit: even with the SharePoint Services can be professional applications for small and medium-sized enterprises quasi assembled without incurring the additional Microsoft licensing fees.
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