Original: CrossOver is a proprietary solution based on the open source Wine project that supports running Windows versions of Microsoft Office , Intuit applications such as Quicken and QuickBooks , Adobe Photoshop versions through CS2 , and many popular games such as World of Warcraft and Team Fortress 2 .
Simplified: CrossOver is a proprietary solution based on the open source Wine project that supports running older Windows versions of Microsoft Office and Adobe Photoshop versions until CS2 .