The new translation layer they’ve been working on for their new VR headset, the Steam Frame. Steam Frame runs on an ARM64 processor so Fex is a translation layer for x86/x64 games to play directly on the Steam Frame hardware. Honestly, in my personal opinion, it feels like a bigger and more impactful project than even Proton because it’s the first step to opening up PC gaming to other chip architectures other than the traditional x86/x64 Intel/AMD chips. What if you could buy an ARM64 Linux PC and still run your entire Valve library on it? That’s the potential future here.