A Reddit user is working on an unofficial version of the Valve game that he will offer for free.
The redditor Tesseract-cat is willing to replicate the Portal game, this time taking into account the benefits of virtual reality from the beginning of its development when implementing its different levels and mechanics with the Unity engine. Once you have recreated all the characteristic elements of the original game, you will make it available to everyone through GitHub or other similar service that is free of charge.
At the moment he says he has managed to replicate the portal system, and he claims to be building all the assets from scratch except for the Gun Portal itself, which will change shortly. The game will also have a level editor where we will build tests to our liking in an intuitive way without removing the viewer.