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Channel: Open Source alternatives to Viber - AlternativeTo.net
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RedPhone

Encrypted voice for Android. RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in. It's easy to use, and functions just like the normal...

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OpenWhatsapp

OpenWhatsapp for BB10 is an Open source IM application that allows you to chat with your http://alternativeto.net/software/whatsapp/ buddies. Features It's native! Being a frequently used application,...

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Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful. You can send messages, photos and videos to people who are in your...

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Kontalk

Kontalk is an open source replacement for WhatsApp. Server and client software are open and hosting your own server is possible but not required. All communication is encrypted.

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TextSecure

Encrypted texts for your smartphone. TextSecure is a messaging app that allows you to take back your privacy while easily communicating with friends. Using TextSecure, you can communicate instantly...

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QuickMSG

QuickMSG is a secure messaging format and an Android App of the same name. With it you can send messages either to other contacts directly or to groups. Its aim is to combine the ease of use that...

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Subrosa

Subrosa is an open source, end to end encrypted messaging app. It supports text, voice and video calls, and all communication is end to end encrypted. Subrosa can be run from any browser, without any...

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GAM Messenger

GAM MESSENGER – GOT A MINUTE? GAM is the instant messaging app that gets straight to the point. It's ideal for sending short and time-sensitive content. Simply send a message to your contact and ask...

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Zulip Chat Server

Powerful open source group chat.

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Isotoxin

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Telegram

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful. You can send messages, photos and videos to people who are in your...

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Tox

With the rise of widespread government monitoring programs, Tox is an easy to use application that allows you to connect with friends and loved ones without anyone else listening in. Tox is built with...

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SeaFour.club

SeaFour is the SeaFour.club community's chat engine, powered by Node.js and Socket.io. It's a socket webchat supporting aesthetic username customization and stylized messages using a markup language...

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Peerio

Peerio is a simple way to send private messages and files and store them in the cloud. Everything inside Peerio is end-to-end encrypted by default, meaning no one but you and your intended recipients...

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Conversations

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]

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Vector.im

Vector is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both public and private and provides messaging, filesharing, voice and video conferencing (beta...

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Wire

Wire is a secure, private and open source messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group chats, file sharing, audio and video messages - everything is...

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Orbit

Instant messaging rooms for the distributed network IPFS Common open source code : https://github.com/haadcode/orbit

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Actor Messenger

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AtomJump.com

AtomJump.com is a well tuned installation of the free open-source AtomJump Loop Server. It is free to chat publicly with your family, group or co-workers on your own group. There is no download...

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