I

im

An XMPP library implemented in the Racket language.

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/

A glossy Matrix collaboration client for the web.

https://element.io/

Matrix Client-Server SDK for JavaScript

Matrix SDK for Android, extracted from the Element Android application

The Matrix SDK for iOS

Matrix SDK for React Javascript

Kontalk official platform independent desktop client

新的沟通方式：社区驱动的即时消息网络。

Kontalk official Android client

https://kontalk.org/

SDK для подключения оплаты через платежную систему IntellectMoney на языке PHP

Tencent Login Service Signature API (aka. TLSSigAPI)

cross-platform Mongolian ( Uighur and Cyrillic) input method 内外蒙文输入法

Federated messenger concept

IM client and server.

Messages are very poorly encrypted.