TrueNAS CORE (previously known as FreeNAS) is a free and Open Source Network-Attached Storage (NAS) operating system that supports file, block and object storage. TrueNAS CORE is FreeBSD based and is a community-supported branch of the TrueNAS project, sponsored by iXsystems. It also has a commercial branch called TrueNAS Enterprise and a free and HyperConverged storage solution called TrueNAS SCALE. The TrueNAS SCALE branch is based on the Debian Linux distribution.
