OpenArena is by OpenArena Team and is licensed under GPLv2. Rune Quake 3 mod (by Jared "KnyteHawkk" Larsen) was downloadable for free; its included stuff is shown here as "fair use". Screenshot captured by The Gig.
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Mod name: Rune Quake 3 Also known as: RQ3, Rune Quake, Rune
Details Screenshot from OpenArena running Rune Quake 3 mod. Here you can see a rune and effect...