Showing 61 open source projects for "messaging"

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  • 1
    Tinode Instant Messaging Server

    Tinode Instant Messaging Server

    Instant messaging platform

    Instant messaging server. Backend in pure Go (license GPL 3.0), client-side binding in Java, Javascript, and Swift, as well as gRPC client support for C++, C#, Go, Java, Node, PHP, Python, Ruby, Objective-C, etc. (license Apache 2.0). Wire transport is JSON over websocket (long polling is also available) for custom bindings, or protobuf with gRPC.
    Downloads: 2 This Week
    Last Update:
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  • 2
    Chat/Messaging App Light and Dark Theme

    Chat/Messaging App Light and Dark Theme

    Flutter UI project for building a messaging app interface

    Chat Messaging App Light and Dark Theme is a Flutter UI project for building a messaging app interface with both light and dark modes. It includes multiple screens that cover the core visual flow of a chat application, starting with a welcome screen and moving into authentication and conversation views. The project is intended as a design and implementation reference rather than a complete messaging backend.
    Downloads: 0 This Week
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  • 3
    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.
    Downloads: 62 This Week
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  • 4
    Tox

    Tox

    A New Kind of Instant Messaging

    ...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: 19 This Week
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  • 5
    Bitchat

    Bitchat

    Bluetooth mesh chat, IRC vibes

    BitChat is a decentralized, peer-to-peer encrypted messaging app built by Jack Dorsey’s Permissionless Tech. It uses Bluetooth Low Energy mesh networking to relay messages without internet, servers, accounts, or phone numbers. Messages are end-to-end encrypted (Curve25519 + AES‑GCM) and the app includes a panic mode to erase data quickly.
    Downloads: 5 This Week
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  • 6
    Session for iOS

    Session for iOS

    A Decentralized, Onion Routed, Private Messenger

    ...On iOS, Session integrates with Apple’s notification and background execution frameworks so that messages arrive reliably while preserving privacy protections, and it supports Face ID/Touch ID unlock to guard access to local message storage. Its interface follows iOS conventions for navigation, attachments, and user interaction, making secure messaging feel natural to Apple users while maintaining rigorous cryptographic standards.
    Downloads: 5 This Week
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  • 7
    OneSignal-iOS-SDK

    OneSignal-iOS-SDK

    OneSignal is a free push notification service for mobile apps

    OneSignal iOS SDK is a leading solution for implementing push notifications, in-app messaging, and customer engagement features in iOS apps. It offers a rich set of tools for targeted messaging, user segmentation, and analytics. OneSignal is widely used for improving user retention and delivering personalized content directly to users.
    Downloads: 0 This Week
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  • 8
    MobileIMSDK

    MobileIMSDK

    The original full-platform IM communication layer framework

    ...It has been developed and refined over many years, making it a mature option for teams building custom messaging systems. MobileIMSDK focuses on the communication layer rather than a complete consumer chat app, so developers can build their own user interface and business logic on top of it. It is useful for mobile apps, web apps, enterprise messaging, live communication features, and custom push systems.
    Downloads: 0 This Week
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  • 9
    Element iOS

    Element iOS

    A glossy Matrix collaboration client for iOS

    Element iOS is the official iPhone and iPad client for the Element communication platform, which is built on the Matrix open standard for secure, federated messaging and collaboration. The app provides users with a rich environment for encrypted messaging, group chats, voice and video calls, file attachments, and room creation, all while interoperating seamlessly with the wider Matrix network — meaning you can communicate across servers and services that adopt the same protocol. On iOS, Element handles user identity, room membership, and end-to-end encryption with strong key management, allowing users to hold secure conversations that only intended participants can read, even across federated instances. ...
    Downloads: 0 This Week
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  • 10
    Berty

    Berty

    Berty is a secure peer-to-peer messaging app

    Berty is an open, secure, offline-first, peer-to-peer and zero trust messaging app. Berty is an encrypted and offline peer-to-peer messenger with no central server. Connect with or without an internet connection, message for free, and avoid surveillance and censorship. Berty is fresh off the development line and hasn’t been audited yet. Please keep this in mind when exchanging data. In some countries, even a lol or a like can get you sent to jail.
    Downloads: 1 This Week
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  • 11
    Signal iOS

    Signal iOS

    A private messenger for iOS

    Signal is a free, open source, messaging app for simple private communication with friends. Say "hello" to a different way of chatting: Signal is all about privacy, but with all the features you expect from a chat app. State-of-the-art end-to-end encryption (backed by Signal's open source protocol) keeps your chats safe. Neither we can read your messages or listen to your calls, nor anyone else.
    Downloads: 22 This Week
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  • 12
    Lantern

    Lantern

    Tool to access videos, messaging, and other popular apps

    Can't access your favorite apps? Download Lantern to easily access videos, messaging, and other popular apps while at school or work. Lantern is an application that allows you to bypass firewalls to use your favorite applications and access your favorite websites. Lantern does not cooperate with any law enforcement in any country. Lantern encrypts all of your traffic to blocked sites and services to protect your data and privacy.
    Downloads: 35 This Week
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  • 13
    libsignal

    libsignal

    Home to the Signal Protocol and other cryptographic primitives

    ...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: 3 This Week
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  • 14
    status-react

    status-react

    A free (libre) open source, mobile OS for Ethereum

    Status is a secure messaging app, crypto wallet, and Web3 browser built with state-of-the-art technology. Join us in creating a browser, messenger, and gateway to a decentralized world. Status is a free (libre) open-source mobile client targeting Android & iOS built entirely on Ethereum technologies. That's right, no middle men and go-Ethereum running directly on your device.
    Downloads: 0 This Week
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  • 15
    NextChat

    NextChat

    Light and Fast AI Assistant

    NextChat is a browser extension that injects a floating ChatGPT-style chat sidebar into webpages, enabling instant AI assistance during web browsing. It supports context-aware chatting using page content, quick queries, and code assistance without opening a new tab. Developers appreciate its customization options—like hotkeys, themes, and engine selection—while everyday users enjoy handy tools for writing, summarizing, or brainstorming on the fly.
    Downloads: 31 This Week
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  • 16
    Telegram MCP

    Telegram MCP

    MCP server to work with Telegram through MTProto

    An MCP server that bridges the Telegram API and AI assistants, enabling seamless interaction between AI applications and Telegram through MTProto. ​
    Downloads: 7 This Week
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  • 17
    at_client_sdk

    at_client_sdk

    The Dart implementation of atSDK used for implementing Atsign

    A secure communication SDK that enables end-to-end encrypted interactions between devices and servers, focusing on data privacy and user control.
    Downloads: 0 This Week
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  • 18
    ntfy.sh

    ntfy.sh

    Send push notifications to your phone or desktop using PUT/POST

    ...It is useful for server alerts, cron job results, monitoring notifications, CI/CD updates, and personal automation. ntfy includes web, mobile, and command-line clients, making it accessible across different environments. Its main value is providing lightweight, open-source notifications without forcing users into a heavy messaging platform or paid push service.
    Downloads: 6 This Week
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  • 19
    PJSIP

    PJSIP

    PJSIP project

    ...It combines signaling protocol (SIP) with a rich multimedia framework and NAT traversal functionality into high-level API that is portable and suitable for almost any type of system ranging from desktops, and embedded systems, to mobile handsets. PJSIP is both compact and feature rich. It supports audio, video, presence, and instant messaging, and has extensive documentation. PJSIP is very portable. On mobile devices, it abstracts system-dependent features and in many cases is able to utilize the native multimedia capabilities of the device.
    Downloads: 8 This Week
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  • 20
    Bluesky Social App

    Bluesky Social App

    The Bluesky Social application for Web, iOS, and Android

    Bluesky Social App is an open-source social networking platform built on decentralized protocols, promoting user control and interoperability. News, jokes, gaming, art, hobbies, and whatever you're into is happening here. Short text posts make for a quick read during coffee, an easy way to wind down the day, or a great way to get connected to your community. Follow your favorite posters or pick from one of the 25,000 feeds to find your people. Join millions of users to be part of the moment...
    Downloads: 1 This Week
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  • 21
    Vellum

    Vellum

    A personal AI assistant that evolves with you

    Vellum is an open-source personal AI assistant platform designed to function as a persistent, autonomous digital companion across desktop and messaging environments. Unlike traditional chatbot interfaces, the project focuses on long-term memory, identity, proactive behavior, and real-world tool usage, enabling assistants to evolve alongside the user over time. The system integrates with macOS, Telegram, Slack, SMS, and additional communication channels while maintaining shared memory and context across platforms. ...
    Downloads: 1 This Week
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  • 22
    Fluwx

    Fluwx

    WeChat SDK for flutter

    fluwx is a Flutter plugin that provides a complete set of integrations with WeChat, one of the largest messaging and payment platforms in the world. It enables login, sharing (text, images, links, music, and videos), WeChat Pay, mini-program launching, and more directly from Flutter apps. The library abstracts platform-specific code for Android and iOS, exposing a unified Dart API. It’s frequently used by apps targeting the Chinese market or international businesses requiring WeChat payment gateways. ...
    Downloads: 1 This Week
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  • 23
    iFrame Resizer

    iFrame Resizer

    Keep same and cross domain iFrames sized to their content

    Size cross domain iFrames to content with support for window/content resizing, and multiple iFrames. This library enables the automatic resizing of the height and width of both same and cross domain iFrames to fit their contained content. It provides a range of features to address the most common issues with using iFrames. Provides a range of page size calculation methods to support complex CSS layouts. Detects changes to the DOM that can cause the page to resize using MutationObserver....
    Downloads: 1 This Week
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    See Project
  • 24
    Notifee Notifications

    Notifee Notifications

    A feature rich notifications library for React Native

    ...Present & handle quick actions alongside your notification content. Actions can be handled in the background or foreground with JavaScript code! Notifee supports many notification styles such as Big Text, Big Picture, Inbox & Messaging on Android and attachments & custom summary text on iOS. Trigger your notifications to display at certain point in the future, or set up repeating triggers to alert your users regularly! Notifications support displaying remote images and local with support for requiring React Native image assets.
    Downloads: 0 This Week
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  • 25
    Rocket.Chat Mobile

    Rocket.Chat Mobile

    Rocket.Chat mobile clients

    ...Engage in contextual interactions with customers irrespective of how they contact you. Ensure long-term relationships and improved business outcomes. Create custom messaging experiences within your app or website by integrating and white labeling Rocket.Chat components and enterprise features. Extend and customize your workspace with custom apps, open APIs, powerful plugins and webhooks.
    Downloads: 0 This Week
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