What options are there for Free for commercial use NoSql Datastores for the .NET world? [closed]

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I've been looking around....

• MongoDB seems to require a commercial license. http开发者_JS百科://www.mongodb.org/display/DOCS/Licensing
• RavenDB has quite a costly scheme. http://ravendb.net/licensing

CouchDB, seems to be free for commercial use? But requires Apache, which is a bit of a pain.

Are there any other good options for .NET?

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From my understanding, MongoDB is open source and free to use. There are two license types: AGPL v3.0 and a commercial license. There are a few minor restrictions with the AGPL 3.0, so some may need to remove these restrictions with a commercial license, but most probably won't.

So in short, I believe it is free and can most likely suit your needs.

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It may or may not apply to you: if you're going to use RavenDB for a startup company, you may request a free license.

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Of course, there's nothing preventing you from using a table in an ordinary SQL database as a simple repository for key-value pairs, which is essentially what a NoSQL database is.

This has the added benefit of still allowing you to use SQL where it is appropriate.

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Cassandra uses Facebook's "thrift" (now Apache Thrift) RPC mechanism for its client layer. This is capable of generating C# output, which you can compile into a .NET assembly and call from a MS CLR application.

Whether Cassandra itself does what you want, is very much dependent upon what you want is.

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https://github.com/mcintyre321/PieDb is a very basic MIT-licenced embedded document db wot I wrote

It

• writes objects to app_data using json.net serialized documents
• uses Lucene.Net.Linq to provide basic IQueryable support
• optimistic concurrency
• requires no configuration

It would be nice to get some other developers behind it, as it's only had about a weekend of work on it, but it works for simple cases as a RavenDb replacement.

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Google has released a beta preview of their Cloud Datastore (previously only available for App Engine apps), but now can be used via their JSON API. It is free up to 1GB with 50K calls per day and there is a paid option after that.

GCD is rather low level, but I wrote a .NET ORM for it called Pogo that supports LINQ. The API is inspired by the RavenDB client API.

The source code and documentation for Pogo is available here - http://code.thecodeprose.com/pogo, and it is also available on Nuget.

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For .Net there is also FatDB, which we used for a smaller project. They have a one year demo version : http://fatcloud.com/