VirtualBoxes (VB Images)

VirtualBoxes.org provides pre-built images for several open-source operating systems.
Please note that:

• Every image contains the latest software as of the day the image was built. Performing updates is on your own, and may require looking for documentation to read using your favourite search engine.
• Default usernames and passwords, where required, can be found next to the download link of each image. You are warmly invited to create your own user, or at least to change passwords, if you intend to use the images in a public environment.

 This project provides virtual machines for Sun XVM VirtualBox®sporting several free and/or open-source operating systems, such as GNU/Linux or Free/Net/OpenBSD for testing, security and/or entertainment purposes.

GNU/Linux (GNU userland tools running on top of the Linux kernel)

• Archlinux (website).
• CentOS (website): the installation is done from the DVD, with default parameters set
• Damn Small Linux (website): the installation is done from the CD, with default parameters set.
• Debian (website): the installation has been done from the netinstall ISO image for the x86 architecture.
• DeLi Linux (website).
• Dreamlinux (website): the installation has been done from the CD, with default parameters set.
• Fedora (website).
• Fluxbuntu (website): the installation is done from the CD, with default parameters set.
• Gentoo (website): the installation is done from the ISO image, then customized .
• gNewSense (website): the installation is done from the CD, with default parameters set.
• gOS (website).
• Kubuntu (website): the installation is done from the CD, with default parameters set.
• LinuxMint (website): the installation is done from the CD, with default parameter set.
• Mandriva (website): the installation is done from the CD, with default parameters set.
• Moblin 2 (website): the installation is done from the .img/.iso file provided by the project.
• moonOS (website).
• OpenSUSE (website).
• PCLinuxOS (website).
• Puppy Linux (website).
• Sidux (website).
• Slackware (website): the installation has been done from the first CD, selecting the bare minimum disk sets.
• SliTaz (website)
• Tiny Core Linux (website)
• TinyMe (website)
• Ubuntu (website): the installation is done from the CD, with default parameters set.
• Ubuntu Server (website): the installation is done from the CD.
• Ubuntu Studio (website): the installation is done from the CD, with default parameters set
• Xubuntu (website): the installation is done from the CD, with default parameters set.
• VectorLinux (website):the installation is done from the CD, with default parameters set.
• Zenwalk (website): the installation is done from the Standard Edition CD, with default parameters set.

GNU/OpenSolaris (GNU userland tools running on top of the OpenSolaris kernel)

• OpenSolaris (website).
• Nexenta (website): the installation is done from the CD.
• MILAX(website): the installation has been done from the official ISO image.

GNU/FreeBSD (GNU userland tools running on top of the FreeBSD kernel)

• Debian GNU/kFreeBSD (website): the installation has been done from the daily mini.iso.

BSD

• FreeBSD (website):the installation is done from the bootonly iso

Other

• AROS (website): the installation has been done from the nightly build ISO image.
• FreeDOS (website): the installation has been done from the official ISO image.
• Haiku (website): the image has been done from the nightly build HDD raw image.
• MINIX (website): the installation has been done from the official ISO image (MINIX 3).
• ReactOS (website): the installation has been done from the official ISO image.
• SYLLABLE (website): the installation has been done from the official ISO image.
• Android-x86 (website): the istallation has been done from the daily ISO image.
• Plan 9 (website): the installation has been done from the ISO image.

(Source)