im

群组消息应用-加密的消息传递、群组聊天和视频通话

A glossy Matrix collaboration client for Android.

https://element.io/

https://f-droid.org/zh_Hans/packages/im.vector.app/

Matrix SDK for Android, extracted from the Element Android application

新的沟通方式：社区驱动的即时消息网络。

Kontalk official Android client

https://kontalk.org/