FSharp was one of the first open source microsoft projects year ago about license: https://github.com/Microsoft/visualfsharp/blob/master/License.txt https://gi

FSharp was one of the first open source microsoft projects year ago about license: https://github.com/Microsoft/visualfsharp/blob/master/License.txt https://github.com/Microsoft/visualfsharp/blob/master/Licens... -> http://www.apache.org/licenses/LICENSE-2.0 http://www.apache.org/licenses/LICENSE-2.0 the open source repo https://github.com/fsharp/fsharp https://github.com/fsharp/fsharp is open source AND accept pull request, the development is done on github, very friendly the .NET too is going opensource, see https://github.com/dotnet/corefx https://github.com/dotnet/corefx (.NET base class libraries) and https://github.com/dotnet/coreclr https://github.com/dotnet/coreclr (.NET virtual machine) and https://github.com/dotnet/roslyn https://github.com/dotnet/roslyn (C#/VB compiler)