72
Found this while searching - https://farside.link/redlib/r/roblox/comments/1qbxvf9/working/_on/_a/_roblox/_alternative/_its/_open/_source/
Edit: they have a CodeBerg (based on ForgeJoe) org, former link: https://github.com/orgs/OkutuProject/repositories
more alternatives are cool but no free hosting is a turn off for me. the biggest advantage of roblox was how easy it was to make a game for my friends in seconds. regardless of that i'll still keep it in my mind.