Spika is messenger module for Web/iOS/Android with backend. You can include messenger feature to your app or service with minimum code.
For detail please visit our web site. http://spikaapp.com
Instruction for each device you can see here.
https://github.com/cloverstudio/Spika/tree/master/web/src/server
https://github.com/cloverstudio/Spika/tree/master/web/src/client
https://github.com/cloverstudio/Spika/tree/master/Android
https://github.com/cloverstudio/Spika/tree/master/iOS
MIT License