closed as off topic by Kit Menke♦ Jan 12 '12 at 0:36
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ESRI offers some good, but potentially expensive products. If you click the link to the product and then the pricing page you can find the details.
If this is for use on your company's intranet, then there would be a fee. http://www.esri.com/software/arcgis/mapping-sharepoint/pricing.html