This repository is a collection of Doom development files that have been relased by John Romero.
The directories are named to match the names of the original .zip files, hence the irregular naming.
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doom_unreleased_music: MIDI files cut during Doom's development, originally composed by Bobby Prince, and released on Romero's website (Original blog post, 2010-04-20). Some of these are alternative versions of tracks that made it into the game. Some more information can be found on the Doom wiki, along with an analysis of some of the metadata from these files.
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DOOMART1993: Assorted collection of artwork, unused sprites, photos and sketches from Doom's development, that were posted on Twitter by John Romero on Doom's 21st birthday (Original tweet, 2014-10-11).
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possessed: Doom zombie sprites that include a full set of rotations for all angles. Some angles were not included in the released IWADs as sprite mirroring was used to save space (Original tweet, 2014-10-12).
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doomguy-all-rotations: Doom player sprites, again with a full set of rotations (Original tweet, 2014-10-12).
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DoomEd: source code to the original DoomEd editor used by id software to make Doom's levels (Doomworld post, 2015-04-22).
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doom-maps: the .DWD format sources to the Doom and Doom II levels, along with the source code to the id BSP builder and doomprint tool used to create the maps for the Doom hint book (Doomworld post, 2015-04-22).
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doom-textures: various textures and other graphics from Doom's development, many of which were cut from the game. These are in .LBM format. doom-textures-png is a conversion of all graphics files from this directory to PNG format that can be viewed in a browser (Doomworld post, 2015-04-22).
The original .zip files can be found on archive.org, while information about the 2015 releases can be found on the Doom Wiki.