CrossOver allows you to install many popular Windows applications on your Mac or Linux computer. You can think of it as an emulator, but it's different, because there's no Windows OS license required. Your applications integrate seamlessly in OS X or Linux; just click and run. No rebooting, no switching to a virtual machine, and no Windows Operating System license required!
Adding new Windows software is easy. Just place your install CD in your machine, and CrossOver will recognize it and offer to install it. Once installed, CrossOver will configure your application to run on your computer. That's all there is to it.