Terry : VirtualBox Base Images

VirtualBox

The native virtual disk image format of VirtualBox is VDI.

VirtualBox offers perfect support for VMDK format, but VDI is recommended for best I/O performance.

OVA / OVF supported, of course.

Base Images

Ubuntu

• Ubuntu Server 14.04.1 LTS amd64 (Trusty)
• Ubuntu Server 12.04.5 LTS amd64 (Precise)
• Ubuntu 13.10 Saucy x86_64
• Ubuntu 13.04 Raring x86_64
• Ubuntu 12.10 Quantal x86_64
• Ubuntu 10.04 LTS Lucid Lynx x86
• Ubuntu Server 13.04 x86_64
• Ubuntu Server 12.10 x86_64
• Ubuntu Server 10.04 LTS x86

Debian

• Debian 7.6 wheezy amd64
• Debian 6.0.7 squeeze x86_64

Arch Linux

• Arch Linux x86_64 (Installed using 2013.02.01 ISO)
  On which archlinux-x86_64.md is based :-D 
• Arch Linux x86
• ArchBang x86
• Chakra OS
• KaOS
• Cinnarch

Oracle Linux

• Oracle Linux 7.0 x86_64 (Vagrant Base Box -> oraclelinux7-x86_64)
• Oracle Linux 6.5 x86_64 (Vagrant Base Box -> oraclelinux-6-x86_64)
• Oracle Linux 5.10 x86_64 (Vagrant Base Box -> oraclelinux-5-x86_64)

CentOS

• CentOS 7.0 x86_64

openSUSE

• openSUSE 13.1 x86_64

UNIX / BSD

• Solaris 11.1 (available on OTN)
• Solaris 10
• FreeNAS 9.2.1.7

Windows

• Windows Server 2003 R2 (32-bit)
• Windows XP Professional SP3 32-bit

Oracle pre-built VirtualBox VMs

http://www.oracle.com/technetwork/community/developer-vm/index.html

Oracle Solaris 11 VM Downloads

http://www.oracle.com/technetwork/server-storage/solaris11/downloads/virtual-machines-1355605.html

Vagrantbox.es (A list of base boxes for Vagrant - OVA)

http://vagrantbox.es

OpsCode bento https://github.com/opscode/bento

Vagrant Ubuntu Cloud Images http://cloud-images.ubuntu.com/vagrant/