Moonlight

Moonlight is an open source implementation of Silverlight, primarily for Linux and other Unix/X11 based operating systems. The last Moonlight release (Moonlight 4 Preview 1) provides support for most features of Silverlight 3, as well as compatibility with Silverlight 4. The Mono project does not provide binary downloads for Moonlight; however, packages for most Linux distributions can be found online, either in official distro package repositories, or provided by popular third-party repositories.