https://wccftech.com/half-life-2-vr-mod-showcased-using-alyxs-engine/

We've previously reported on a Half-Life 2 VR mod that was approved on the now defunct Steam Greenlight program about three years ago.

However, nothing ever came of it. The project is still in the works, according to its makers, but only in a voluntary, part-time fashion as outlined below.