The Microsoft .NET Framework is a development and execution environment that allows different programming languages and libraries to work together seamlessly to create Windows-based applications that are easier to build, manage, deploy, and integrate with other networked systems.
Native Linux Alternative:
Mono is a cross platform, open source .NET development framework.
Microsoft Open-Source Initiative:
In order to support the open source community around .NET, Microsoft spawned the .NET Foundation. They have an organization portal on GitHub, where the source code of the .NET core libraries is being published under the MIT License.
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