OVFAppliances.com
About Open Virtualization Format (OVF)
Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or more generally software to be run in virtual machines.
The standard describes an "open, secure, portable, efficient and extensible format for the packaging and distribution of software to be run in virtual machines". The OVF standard is not tied to any particular hypervisor or processor architecture.
These images run in Virtualization systems that support OVF, like VirtualBox and VMWare
OVFAppliances.com
An extension of VirtualBoxImages.com. OVF Appliances prepared with VirtualBox Virtualization software.
OVF Images can be imported to many different Virtualization
Open-OVF Project: http://sourceforge.net/projects/open-ovf/