No really. Many proprietary software are source available but far from being open source. Even Microsoft Windows is source available if you are an important cu

No really. Many proprietary software are source available but far from being open source. Even Microsoft Windows is source available if you are an important customer: https://www.microsoft.com/en-us/sharedsource/default.aspx https://www.microsoft.com/en-us/sharedsource/default.aspx A bit more public and open to anyone is Unreal Engine's source code: https://dev.epicgames.com/documentation/en-us/unreal-engine/downloading-unreal-engine-source-code https://dev.epicgames.com/documentation/en-us/unreal-engine/...