UUnit
https://docs.unity3d.com/Manual/index.html Unity has a custom license and subscription, linked to their editor. https://unity3d.com/get-unity We are not distributing the Unity-editor, or any Unity source. We are distributing a unity-example-project and PlayFab add-on for Unity. The PlayFab code can be examined with any text editor, but the project can only be opened with a properly licensed Unity3d editor, version 5.x or higher. Uunit Download location: https://docs.unity3d.com/Manual/index.html License: https://creativecommons.org/licenses/by-sa/3.0/UUnit system from UnityCommunity
Heavily modified
0.4 release by pboechat
https://docs.unity3d.com/Manual/index.html
https://creativecommons.org/licenses/by-sa/3.0/