http://www.mono-project.com/

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Mono provides the necessary software to develop and run .NET client and server applications on Linux, Solaris, Mac OS X, Windows, and Unix.

Features
    * Multi-platform.
    * Based on the ECMA/ISO standards.
    * Runs ASP.NET and Winforms applications.
    * Can run .NET, Java, Python and more.
    * Open Source, Free Software.
    * Commercially supported.
    * Comprehensive technology coverage.

找到这个,不过我也没用过