Scientific Linux is a free community project that rebuilds the source packages for Red Hat Enterprise Linux and adds a handful of enhancements. Several scientific laboratories and universities in the United States, Switzerland, and other countries are involved in this project. There are some sites that have tweaked the base distribution a bit further, like CERN Linux and Fermi Linux. The first Scientific Linux release was 3.0.1, released May 10, 2004. Scientific Linux 3.0.4 Cern - i386 and x86_64 was released February 11, 2005. SL Fermi LTS v3.0.4 was released February 22, 2005. Supported versions of Scientific Linux: 6.9 (released April 17, 2017), and 7.5 (released May 10, 2018).