tofino http://www.ensemble.com/products/tofino.html
Ensemble Tofino for Visual Studio is a plugin that enables .NET developers to create Flex front ends for their applications in the same IDE that they normally use. Instead of using a separate text or XML editor and manually invoking the compiler, they can move smoothly between MXML and .NET file types within Visual Studio, and invoke Flex build and run commands from Visual Studio menus.
Amethyst (Adobe Flex IDE) http://www.sapphiresteel.com/Download-Amethyst-Adobe-Flex-IDE
Amethyst is SapphireSteel’s IDE for programming rich web-based and desktop applications using Adobe Flex and AIR [1 ] . This page includes a link to download Amethyst (beta), plus information on its installation and use. Please be sure to read the installation advice before installing Amethyst
老外的想法不得不佩服!