Browse free open source Messaging platforms and projects for Android and Linux below. Use the toggles on the left to filter open source Messaging platforms by OS, license, language, programming language, and project status.

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  • 1
    Sideband

    Sideband

    LXMF client for Android, Linux and macOS to communicate with people

    Sideband is a privacy-focused, peer-to-peer mesh messaging protocol and platform that allows users to communicate directly over local networks or the internet without servers. It emphasizes metadata resistance and secure message delivery, working effectively in offline, low-bandwidth, or disaster recovery scenarios. Built-in Rust, Sideband supports encrypted group messaging, file transfers, and network self-discovery. It is ideal for use in community networks, crisis response, and decentralized communications infrastructure.
    Downloads: 20 This Week
    Last Update:
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  • 2
    Tox

    Tox

    A New Kind of Instant Messaging

    Tox is a peer to peer (serverless) instant messenger that focuses on security and privacy. In today's world where digital surveillance is rampant, Tox offers users a communication software alternative that's free from prying eyes and ears, and is, quite literally free and without advertising. Tox comes with all the great features you'd expect from an instant messenger application, including voice calls, video calls, file sharing and screen sharing. Everything done on Tox is encrypted using open-source libraries so you can be assured of completely private conversations. It also has no central servers that can be raided, shut down, or forced to turn over data. There are no corporate interests, no hidden agendas-- just simple, secure and easy to use messaging.
    Downloads: 17 This Week
    Last Update:
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  • 3
    GoldBug - Encrypted Communications

    GoldBug - Encrypted Communications

    Chat Messenger. E-Mail-Client. Websearch. Filetransfer.

    GoldBug is a decentralized & secure communication suite that offers an integrated e-mail client, an instant messenger & a file transfer. Also included is an URL-RSS-DB & a p2p web search. Current vers. w/ McEliece Algorithm. GoldBug has been 2013 - 2023 ten years just another Graphical User Interface of the Spot-On Encryption Suite. Main GUI features: Minimal & colorful Interface with Tabs in the East. Microsoft & Qt MinGW deprecated Win32 & for Compiling: ● https://sourceforge.net/p/goldbug/wiki/compiling As Spot-On implemented the minimal GB-concept & Nuvola Icons, GoldBug has now been fully integrated into Spot-On Win64: Just choose Tabs at East & Mini-View in Options - w/ Nuvola Icons of course! Voilá! & Many Thanks, Pro-Files can be found archived at ● current source: https://github.com/textbrowser/spot-on ● EN Manual: https://www.amazon.com/dp/3749435065 ● DE: https://compendio.github.io/goldbug-manual-de/ ● Study: https://www.amazon.com/asin/dp/3750408971
    Downloads: 27 This Week
    Last Update:
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  • 4
    libsignal

    libsignal

    Home to the Signal Protocol and other cryptographic primitives

    libsignal is the foundational cryptographic library that implements the Signal Protocol and other essential primitives used across the official Signal clients and servers, enabling secure end-to-end encrypted communication. Written primarily in Rust with bindings and APIs surfaced for Java, Swift, and TypeScript, this library encapsulates critical algorithms like the Double Ratchet, prekey mechanisms, secure key storage, and zero-knowledge group primitives, along with additional utilities for media handling and device key transfer. libsignal abstracts complex cryptographic constructions into reusable components that client applications can adopt to ensure forward secrecy, authentication, and integrity without re-implementing core security logic. Although its primary use is within the Signal ecosystem, its documentation and exposed interfaces allow developers to explore modern secure messaging primitives or use pieces of the protocol in experimental applications.
    Downloads: 1 This Week
    Last Update:
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  • 5
    Smoke Crypto Chat Messenger for Android

    Smoke Crypto Chat Messenger for Android

    Smoke: Android Crypto Chat Messenger

    Smoke is an encrypting chat messenger for Android written in Java. Please read the Web site for more information: https://textbrowser.github.io/smoke/ (original, current) https://www.amazon.com/dp/3752691999/ https://smokeappope.sourceforge.io/ (old, third party archive) Smoke App OPE - Open Personal Encryption Download Android APK Installer: https://sourceforge.net/projects/smokeappope/files/ Smoke Source: https://github.com/textbrowser/smoke SmokeStack Source: https://github.com/textbrowser/smokestack (Android) https://github.com/textbrowser/spot-on (Desktop) Smoke appears to be one of the first projects with an open source mobile encrypting chat server., an decentralized and easily-configurable chat server. Smoke is known as the first mobile McEliece Messenger: https://tarnkappe.info/artikel/english/mceliece-messaging-smoke-crypto-chat-the-first-mobile-mceliece-messenger-published-as-a-stable-prototype-worldwide-279847.html
    Downloads: 5 This Week
    Last Update:
    See Project
  • 6
    Qiks LAN messenger

    Qiks LAN messenger

    Qiks is a LAN messnger to chat and transfer file esily.

    Qiks is a LAN messenger.You can chat with your friends and transfer files within same netowork.You can use Qiks at your home and office.
    Downloads: 2 This Week
    Last Update:
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  • 7
    Downloads: 0 This Week
    Last Update:
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  • 8
    Tattle Talk

    Tattle Talk

    Android App for communication

    Tattle Talk is an Android app for social communication like Google Talk and Yahoo Messenger. It is still in Prototype. You can still try it out if it works. It is intended for Android Application only. Although, there is lot of improvements has to be made. I will try to make more improvements whenever I get time. Thanks anyways.
    Downloads: 0 This Week
    Last Update:
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  • 9
    Downloads: 0 This Week
    Last Update:
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  • 10
    Telegram中文版

    Telegram中文版

    telegram中文版下载

    Telegram-消息传递的新时代, 简单的 Telegram非常简单,您已经知道如何使用它。 私人的 电报消息经过高度加密,可以自毁。 已同步 Telegram让您可以从多个设备访问您的聊天记录。 快速地 Telegram传递消息的速度比任何其他应用程序都要快。 强大的 Telegram对您的媒体和聊天的大小没有限制。 打开 Telegram为所有人免费提供开放的API和源代码。 安全的 Telegram使您的消息免受黑客攻击。 社会的 Telegram群组最多可容纳 200,000 名成员。 表现力 Telegram可让您完全自定义您的信 telegram中文版安卓手机端下载 telegram中文版电脑端下载
    Downloads: 0 This Week
    Last Update:
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  • 11
    WinT Messenger

    WinT Messenger

    Simple and lightweight IM client

    WinT Messenger is a practical instant messaging application that its developed by a small team of students working in the WinT 3794 team. The application is written in QML/C++ and can be used with the most popular desktop and mobile operating systems.
    Downloads: 0 This Week
    Last Update:
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