Linux

Doom was ported to Linux in 1994 by Dave D. Taylor of id Software. The last Linux Doom binaries were provided by id on October 13, 1996 through the company's FTP server.

It was this version whose source code was later released (the DOS version could not be released due to copyright issues concerning the sound library). Originally, the code was distributed under the Doom Source License, but it was later reissued under the GNU General Public License.