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A curated list of awesome FOSS games
(github.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
In your link, the source is in the src folder
The license is GPLv2. I believe the file is called GNU.TXT in the repository, at least that's what I have in mine https://github.com/InFerYes/dday
Additionally there's LICENSE.TXT with some information by Id Software, who open sourced the engine on which this game is based.
My repository's code is what runs on the active servers. Powabanga's has installers for the clients.