Mac users interested in Osx 10.5.8 crossover generally download:
Simplify the process of running Windows productivity applications and PC games on your Mac. Operate Windows software on your Mac at home, work, or school, all without the need for a Windows license, computer reboot, or virtual machine. Furthermore, the app supports a wide array of Windows software.
PlayOnMac is a program that allows you to install and run Windows apps on your Mac. This application makes it possible for any Mac user to work with Windows apps and to play games developed for Microsoft Windows with minimum effort. The program comes with a very easy to use interface.