Voice Chats for Android

An encrypted messaging app focused on privacy, supporting texts, calls, photos, videos, files, and group chats, with no ads or trackers.

Experience instant messaging with remarkable speed and robust security. Join massive group chats or channels. Enjoy free and advanced features.

A secure collaboration app with end-to-end encryption and interoperability across web, desktop, and mobile. Includes chat, voice, and video calls.

A versatile platform for text and voice communication, featuring topic-specific channels, customizable moderation, and smooth low latency interactions.

Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control.

Go ahead, video chat with the whole team. In fact, invite everyone you know. Jitsi Meet is a fully encrypted, 100% open source video conferencing solution that you can use all day, every day, for free.

Free messaging without SMS fees, web sync, and multimedia sharing, supporting group and video chats, available on iPhone, Android, and desktop.

Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement

Stoat (previously Revolt) is a chat platform that puts users first. With text & voice channels, video calling, screen sharing, permissions, mod tools, bots & more. Join any community or build one just the way you like it. It also respects your privacy.

Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.

RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .

Use crystal clear sound to communicate with your team mates cross-platform with military-grade security, lag-free performance & unparalleled reliability and uptime.

It is the brand new, and fastest ever, Matrix client. It is for personal and community use, and will support enterprise functionality later this year.

Secure messaging, free calls, group chats up to 250, emoji reactions, disappearing messages, low-cost international calls, rich media and community channels.

Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.

Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].

Offers high-quality video conferencing and screen sharing, supporting up to 100 interactive participants with features like whiteboard collaboration.

kMeet is an unlimited, free, Swiss solution for organising encrypted video-conferences.

SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network.

LINE is transforming the way people communicate, closing the distance between family, friends, and loved ones for free.

Thirdlane Connect is a versatile collaboration tool that combines messaging, voice, video, and app integration into a cohesive and efficient experience on any platform.

Enhance your live game streaming with real-time voice changes and effects, versatile integration into apps like Discord and Twitch, ideal for entertainers.

Gather is a video-calling space that lets multiple people hold separate conversations in parallel, walking in and out of those conversations just as easily as they would in real life.

Airchat is a voice-based social media platform similar to a social walkie-talkie. It encourages concise speech without the need for emojis or memes. It automatically transcribes voice clips to text, however, it does not offer editing options.

3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.

Offers a free trial period, after with you need to upgrade to paid subscription.