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SAMBA is a service that allows windows clients to share files served by a Linux/Unix file server.

Allows Unix applications to run on Windows.

Provides a virtualisation environment so Windows (and other OSes) can run in a window on Linux.

A Windows emulation environment for Linux.

Crossover Office is a commercial release of WINE focussing on application stability for major office applications.

Developers of WineX, a a version of Wine that aims achieve full Linux compatibility for games developed using DirectX APIs.