The source code for the original "Doom" and "Doom 95" first-person shooter video games was released into the public domain in 1997. Was the original "Doom" freeware? No, you had to buy it on various floppy disks.
How to Get CLASSIC DOOM for Free on PC! (UPDATED)
Since this release there have been dozens of source ports and clones, and thousands of mods. This includes clones of the original Windows version of the game "Doom 95" and also the MS-DOS versions.
It is important to note that any site offering an original id Software "Doom" freeware download is illegal. This is an option you should avoid.
"Doom" is still a licensed game and the only way to play it legally is to pay and download the game from Gog.com.
