VMware Player and Virtual Machine Center
"VMware Player is free software that enables PC users to easily run any virtual machine on a Windows or Linux PC. VMware Player runs virtual machines created by VMware Workstation, GSX Server or ESX Server."
"VMTN's collection of pre-built virtual machines from industry-leading ISV and open source partners simplifies software packaging, distribution, and deployment. Instead of spending time installing and configuring applications, developers and QA teams can now focus their efforts on development and testing.
To download any pre-built virtual machines below, you will need to register and download from each partner's site. Then to run these virtual machines with the application software pre-installed and configured, simply download and install the free VMware Player."