StableBit DrivePool - State of the art, file based drive pooling software.
Swizzin - swizzin is a light, modular package management suite for media oriented servers.
btrfs - Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features...
FlexGet - FlexGet is a multipurpose automation tool for all of your media
Greyhole - Greyhole is an application that uses Samba to create a storage pool of all your available hard drives, and allows you to create redundant copies of the files you store, in order to prevent data loss when part of your hardware fails.
QuickBox - New gen seedbox install script which features a complete UI and addons system