According to qt.nokia.com, Qt is a \"cross-platform application and UI framework\", allowing you to \"write code once to target multiple platforms\". The Qt SDK is a \"complete
You can use MinGW to cross-compile on Linux for Windows. Cross-compiling to Mac is not possible due to technical problems. There is no easy mean to do this from GUI but here is a nice how-to on cross compiling QtWebKit for Windows. That can be applied to any Qt project.