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Photon Unity Networking Free

By Exit Games, Free

The ease-of-use of Unity's Networking plus the performance and reliability of the Photon Cloud.

Photon Unity Networking FREE:
this package is all you need to easily add multiplayer to your games and launch them globally with the included FREE Photon Cloud plan.

Note: You can export to all Unity platforms with Unity 5.x Personal/Pro. In case you use Unity 4.x you need Unity Pro orPhoton Unity Networking PLUS (PUN+) in order to export to iOS and Android.

Low learning curve: The PUN API is very similar to Unity's networking solution!
Always connects: Works across different (mobile) networks, no punchthrough issues.
Convertible: A script ports your Unity Networking project. 90% work: Done.
Global low latency: Photon Cloud's hosting centers in US, Europe, Asia (Singapore, Japan) & Australia provide low latency for your games all over the world.

More info:
Unity Forum Thread and Product Website.
Open Asset Store

Requires Unity 4.3 or higher. Update now.