Half-Life Engine JS
Half-Life is one of my favorite games. Not only because it was revolutionary when it was released, but also because I have spent countless hours creating maps and mods for it. In retrospect, I think being involved in the Half-Life modding community taught me a lot about game design and programming. Out of nostalgia, I recently dug into old maps I had designed. While they still can run with the original game, I wondered if they could also run in the browser as a way to preserve them forever.
I have used it to host online old maps I have created, such as Half-Life Parpaing or a virtual tour of a nuclear power plant. Give them a try!