CodeWeavers' CrossOver Linux is a software framework that emulates the Microsoft Windows 98, 2000 and XP application programming interfaces (APIs) on GNU/Linux. This allows Windows programs to run on GNU/Linux without having to run a virtual instance of the operating system e.g. a virtual machine. CrossOver was originally designed to bring Microsoft Office and Intuit Quicken to GNU/Linux, but many more programs have been tested and are known to work with CrossOver to some degree at this time.