Multitracks
Nine Inch Nails have pioneered the idea of giving away multitracks or song masters away to the general public for remix purposes. All multritracks are available for download here.[1]
The Fragile era
In 1999, nin.com had multitrack clips up of three songs in swf format. None of the songs from this era were released with complete multitracks.
"Starfuckers, Inc." was released as 21 separate 13-second files.
"The Day The World Went Away" was released as 17 separate 14-second files.
"The Big Come Down" was released as 15 separate files of varying lengths.
With Teeth Era
"The Hand That Feeds" was the first multitracks of two songs to be released for this album, released via nin.com on April 15th, 2005 in Garageband format (with RAW AIFFs).
"Only" was released on June 25th, 2005 in more formats than the previous multitrack.
Year Zero era
"Survivalism was the first of this album to be released on March 13th, 2007. Additional multitracks to be released are "God Given", "Me, I'm Not", "Capital G", "My Violent Heart" and "The Beginning of the End". Other multitracks from this era will released with Year Zero Remixed as well as for download.
Other
In addition, the Pigface version of "Suck" was released as multitracks for a remix competition.