This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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ioquake3
ioquake3.org
did:plc:xz3xbdj7hfq73wnjgec7a4pz
ioquake3 is a 20 year old version of the engine behind Quake 3: Arena. You can use it to play Quake 3, Team Arena, mods, or make your own game. Find out more here: https://ioquake3.org/