Photon Engine Multiplayer

Realtime Intro | Photon Engine

Global cross platform multiplayer game backend as a service (SaaS, Cloud) for synchronous and asynchronous games and applications. SDKs are available for android, iOS, .NET., Mac OS, Unity 3D, Windows, Unreal Engine, HTML5 and others.

Source: doc.photonengine.com/en-us/realtime/current/getting-started/realtime-intro