Grumpy Old Geeks Products ioquake3 Product ioquake3 2 mentions in 1 episode ioquake3 is a free, open-source engine based on Quake III Arena and Quake III Team Arena source code. Mentions 717: Quantum of Nope Oct 10, 2025 46:18 There's a port out called IOQuake 3, which is a free and open-source software first-person shooter engine 46:40 you still have to own the game to play it