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Re:GitHub – Open Source Messenger App for Android by wjjdjw on Thursday February 07, 2019 @02:58AM (#19103758)
Why? What? And what's the name?

http://mesibo.com

Quote from the FAQ: With Mesibo, you can quickly add real-time messaging, voice and video calling (like whatsapp) in your own app in no time.

Re:GitHub – Open Source Messenger App for Android by asaddhamani on Thursday February 07, 2019 @03:03AM (#19103779)
It's mainly a chat BaaS, and you can develop your own UI on top of their libraries.