File system: ReiserFs

ReiserFS - journaling file system invented for Linux by Namesys company. Now ReiserFs supported only by Gnu/Linux, but it's possible to use it on other operatin systems in future. ReiserFs appeared in version 2.4.1 of Linux kernel and became journaling file system included to kernel.
ReiserFs - native file system of: Slackware, Suse, Xandros, Yoper, Linspire and Kurumin Linux.