OpenMediaVault is distributed as Installation Image in ISO-Format. Images can be burned to CD / DVD or you can use them to create a bootable USB-Stick for installation on systems without an optical drive.
Up to date installation images for download are stored at sourceforge: http://sourceforge.net/projects/openmediavault/files/
The package repository can be accessed via http://packages.openmediavault.org/public. The repository is signed with PGP key ID: 2EF35D13, Fingerprint 0F6B CC17 C26B FADC 27F2 2100 7E7A 6C59 2EF3 5D13.
The Source code repository is also stored at sourceforge: http://scm.openmediavault.org/