StableBit DrivePool - State of the art, file based drive pooling software.
Radarr - A fork of Sonarr designed to work with Movies.
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.
FlexGet - FlexGet is a multipurpose automation tool for all of your media
mhddfs - The driver combines a several mount points into the single one.
Sick Beard - Sick Beard is a PVR for newsgroup users (with limited torrent support).