Mono is a cross-platform, open-source .NET framework compatible with Microsoft's .NET. It enables developers to build and run .NET applications on Linux, macOS, and other Unix-like systems. Mono is especially useful for running .NET applications in non-Windows environments or for building cross-platform tools.

Features of Mono:

• Implements ECMA standards for C# and the Common Language Infrastructure (CLI).
• Supports ASP.NET, ADO.NET, Windows Forms (via Gtk#), and more.
• Allows cross-platform development and deployment of .NET applications.
• Includes compilers, runtime, libraries, and development tools.
• Actively developed with support for modern .NET features and languages.

$ sudo su

$ /tmp/mono-mono-6.12.0.206/runtime/_tmpinst/bin/mono --version

Disclaimer: Mono is an open-source software project led by the Mono community and originally developed by Xamarin. It is distributed under the MIT License. This description is for educational purposes only and is not officially affiliated with or endorsed by the Mono or .NET Foundation. Use at your own risk.