Quicall

Secure messaging with chat, voice and video calls.

Olvid

面向所有人的私密消息

baresip+

VoIP and mobile calling and messaging app based on baresip library

baresip

基于 baresip 库的 Android VoIP 和移动通话及消息传递应用

Duetto

A tiny Discord for two, on your own server: a permanent voice and video channel.

Conversations

为您的移动设备提供加密、易用的 XMPP 即时通讯软件

Wire • Secure Messenger

Wire offers highly secure communication – anywhere and anytime.

TRIfA

TRIfA Tox 客户端

Session F-Droid

加密私人信使

Ermis

Ermis M is an open-source, privacy focused mobile chat application.

SimpleX Chat

SimpleX Chat - e2e encrypted messenger without any user IDs - private by design!

Nextcloud Talk

Have private video calls and chat using your own server.

another.im

Yet Another Conversations fork but...

Threema Libre

Secure and private messaging

aTalk

XMPP/Jabber client with encrypted instant messaging and video calls

Element X - Secure Chat & Call

Sovereign. Seamless. On Matrix

Jami

自由且私密地分享

Element Classic

Previous generation Element

Cheogram

Chat on the Jabber network (XMPP protocol); focus on features for gateway users

monocles chat

是功能齐全的 XMPP 聊天客户端

Jitsi Meet

即时视频会议，能够高效适应不同规模

Mumla

在 Mumble 服务器上语音聊天

Snikket

Personal messaging app for groups, with a self-hostable open-source server

Linphone - open source SIP client

SIP（VoIP）电话

Meshenger

开源 P2P 通讯软件

ThreatScoopOnionChat

A Forked Version focused on privacy from SESSION

Sipdroid

SIP（VoIP）客户端

Databag

A federated chat client designed for privacy and selfhosting.

StoneAge

A self-hosted P2P messenger - you will need an S3 bucket to use it

unofficial Stud.IP-app

An unofficial app for Stud.IP systems.