Here is possible on Mac Os X with eclipse4SL, a tool developed by Soyatec with the collaboration of Microsoft. The prupose of this project is the creation of opensource tools integrated with the Eclipse development environment.
Mac and Windows developers can now collaborate on Silverlight projects using the Eclipse or Visual Studio IDEs. We have also added several new features to the project that should please all developers like C# code generation and improved XAML auto-completion
Up to now you can only develop silverlight 2.0 application but in the next release silverlight 3 support will be available. You have to wait until spring 2010.
The features included in the current release are :
- Silverlight 2.0 support
- C# code editor with syntax colorization, keywords and template code completion assist
- Automatic Build & Run
- Configurable Web application launch facilities
- Silverlight Project System and Silverlight Compiler: both an advanced project system for creating Silverlight applications and media experiences.
- XAML Editor & Preview: advanced, standards-compliant XAML editor with code hinting and code completion features which helps detect and correct coding errors.
- Move and Rename refactoring
- Advanced Media Features
- Complete user documentation & Prescriptive Tutorials
- Defects & Regression Testing
- Developer Usability Testing
It is easy to install, use and it is well finished.
Screenshots:






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