Here is a small list of extensions that works with plyGame and NJG Blox:

Audio Toolkit:
http://ninjutsugames.com/unityassets/photonblox/extensions/AudioToolkit-Blox.unitypackage

EZ Replay Manager:
http://ninjutsugames.com/unityassets/photonblox/extensions/EZReplayManager-Blox.unitypackage

Pool Manager:
http://ninjutsugames.com/unityassets/photonblox/extensions/PoolManager-Blox.unitypackage

Text Mesh Pro:
http://ninjutsugames.com/unityassets/photonblox/extensions/TextMeshPro-Blox.unitypackage