Scientific Linux 6.3 are available in 32-bit and 64-bit variants. This x86_64 are working in 64bit machines only and come with following window managers, LiveMiniCD - IceWM, LiveCD - GNOME, LiveDVD - GNOME, KDE, IceWM. Software was added from rpmforge, epel and elrepo (see EXTRA SOFTWARE) to include additional file system support (NTFS, ReiserFS), secure network connection (OpenVPN, VPNC, PPTP), file system tools (dd_rescue, ddrescue, GParted, gDisk), and better multimedia support (FFmpeg, Flash).
 
About Scientific Linux
Scientific Linux is a recompiled Red Hat Enterprise Linux, co-developed by Fermi National Accelerator Laboratory and the European Organization for Nuclear Research (CERN). Although it aims to be fully compatible with Red Hat Enterprise Linux, it also provides additional packages not found in the upstream product; the most notable among these are various file systems, including Cluster Suite and Global File System (GFS), FUSE, OpenAFS, Squashfs and Unionfs, wireless networking support with Intel wireless firmware, MadWiFi and NDISwrapper, Sun Java and Java Development Kit (JDK), the lightweight IceWM window manager, R - a language and environment for statistical computing, and the Alpine email client.