The Fedora Project is perhaps one of the hallmark Linux distributions. Fedora is sponsored by Red Hat, the commercial developer of Red Hat Enterprise Linux (RHEL). Red Hat's investment in the Fedora community is collaborative. As such, Fedora Linux releases often provide RHEL developers with a field test environment that incubates innovative open source software technologies. Red Hat Linux 1.0 was released in late 1994 as Red Hat Commercial Linux. It was the first Linux distribution to use the RPM Package Manager as its packaging format.