It's free for open source projects. For commercial enterprise, Raven is effectively $788/core/year [0]. Quite reasonable, IMO. Contrast this with MS SQL Serve

It's free for open source projects. For commercial enterprise, Raven is effectively $788/core/year [0]. Quite reasonable, IMO. Contrast this with MS SQL Server Enterprise, which appears to be $14,000/core one-time cost [1]. (Disclaimer: I'm a part-time employee for RavenDB. But I loved and used Raven on my own projects before becoming an employee.) [0]: http://ravendb.net/buy http://ravendb.net/buy [1]: http://www.microsoft.com/en-us/server-cloud/products/sql-server/purchasing.aspx http://www.microsoft.com/en-us/server-cloud/products/sql-ser...