Online IDEs for C# - frill free Visual Studio alternatives

Got a quick C# snippet to try out but don't want to use Visual Studio or don't have the resources on your computer right-away? There are some great desktop alternatives to VS to run snippets but did you know, there are also online IDEs for running .NET code:
This type of web applications that allow their users to upload snippets of text, usually samples of source code, for public viewing, are called Pastebins. There are plenty of Pastebins now, but the above list lets you run C# programs.

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