virtualbox-guest-tools from Virtualization:VirtualBox_backports project

For openSUSE Factory run the following as root:

zypper addrepo https://download.opensuse.org/repositories/Virtualization:VirtualBox_backports/openSUSE_Factory/Virtualization:VirtualBox_backports.repo
zypper refresh
zypper install virtualbox-guest-tools

For openSUSE 12.2 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/Virtualization:VirtualBox_backports/openSUSE_12.2/Virtualization:VirtualBox_backports.repo
zypper refresh
zypper install virtualbox-guest-tools

For openSUSE 12.1 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/Virtualization:VirtualBox_backports/openSUSE_12.1/Virtualization:VirtualBox_backports.repo
zypper refresh
zypper install virtualbox-guest-tools

For SLE 11 SP1 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/Virtualization:VirtualBox_backports/SLE_11_SP1/Virtualization:VirtualBox_backports.repo
zypper refresh
zypper install virtualbox-guest-tools