History
The first version of Entity Framework (EFv1) was included with .NET Framework 3.5 Service Pack 1 and Visual Studio 2008 Service Pack 1, released on 11 August 2008. This version was widely criticized, even attracting a 'vote of no confidence' signed by approximately one thousand developers.
The second version of Entity Framework, named Entity Framework 4.0 (EFv4), was released as part of .NET 4.0 on 12 April 2010 and addressed many of the criticisms made of version 1.
A third version of Entity Framework, version 4.1, was released on April 12, 2011, with Code First support.
A refresh of version 4.1, named Entity Framework 4.1 Update 1, was released on July 25, 2011. It includes bug fixes and new supported types.
The version 4.3.1 was released on February 29, 2012. There were a few updates, like support for migration.
The latest version is 5.0.0 and is targeted at .NET framework 4.5. Also, this version is available for .Net framework 4, but without any runtime advantages over version 4.
Starting from version 6, Entity Framework is an open source project licensed under Apache License v2. Like ASP.NET MVC Framework, its source code is hosted at CodePlex using Git.
Read more about this topic: ADO.NET Entity Framework
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—Karl Marx (1818–1883)