The collection of source code releases for Doom Classic for iOS (since then replaced by the Unity port) based on the PrBoom source port. As such, it is licensed under the GNU Public License Version 2.
History release:
1.0: Original release available from id's FTP server. Released on November 8, 2009 (earliest date with the source code link on the Wayback Machine).
2.1: Update release, available from Bethesda Blog. Released on September 8, 2011.
3.0: Last release, available from GitHub. Released on January 12, 2014.
DOOM-IOS2-master.zip | SHA-1: bdc1b5369fc5cd6a0413fbc7a02e9c410cc81893 / MD5: 890179e63e8caeb9d935d30247afa2e7 / CRC32: 6a3e88e8. This custom ZIP file was made on the fly by GitHub and is only provided for the sake of completition.