Showing 498 open source projects for "operating systems mobile"

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    Atera all-in-one platform IT management software with AI agents

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    Cloud data warehouse to power your data-driven innovation

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  • 1
    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: 18 This Week
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  • 2
    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...
    Downloads: 17 This Week
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  • 3
    Signal

    Signal

    A private messenger for Android

    Signal-Android is the official open-source Android client for Signal, a secure messaging app focused on end-to-end encryption and privacy. Developed by the Signal Foundation, it enables private messaging, voice, and video calls, without storing user data. Signal uses the Signal Protocol for encryption and does not collect metadata, making it one of the most privacy-focused communication platforms available.
    Downloads: 6 This Week
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  • 4
    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. Persistent storage is any one of RethinkDB, MySQL or MongoDB. A third-party unsupported DynamoDB adapter also exists. Other databases can be...
    Downloads: 13 This Week
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  • Rezku Point of Sale Icon
    Rezku Point of Sale

    Designed for Real-World Restaurant Operations

    Rezku is an all-inclusive ordering platform and management solution for all types of restaurant and bar concepts. You can now get a fully custom branded downloadable smartphone ordering app for your restaurant exclusively from Rezku.
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  • 5
    Zulip

    Zulip

    Powerful open source team chat application

    Zulip is a powerful open source group chat application that combines the immediacy of real-time chat with the productivity benefits of a threaded conversation model. Zulip’s unique threading model allows users to easily catch up on important conversations, helping to save time and increase productivity.
    Downloads: 3 This Week
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  • 6
    Facebook SDK for Android

    Facebook SDK for Android

    Used to integrate Android apps with Facebook Platform

    This open-source library allows you to integrate Facebook into your Android app. Integrate your Android app with Facebook to build engaging social apps by using the Facebook SDK for Android. To learn more about using Facebook development tools. The current version of the Facebook SDK for Android is version 11.2.0 and requires the Android API 15. Code and samples for the Facebook SDK for Android are available on GitHub. A secure and convenient way for people to log into your app or website by...
    Downloads: 5 This Week
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  • 7
    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...
    Downloads: 5 This Week
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  • 8
    GiftedChat

    GiftedChat

    The most complete chat UI for React Native

    See the files in example-slack-message for an example of how to override the default UI to make something that looks more like Slack, with usernames displayed and all messages on the left. Avatar as user's initials. Localized dates. Multi-line TextInput. InputToolbar avoiding keyboard. Redux support. System message. Quick Reply messages (bot). Typying indicatior react-native-typing-animation. If you decide to specify a text prop, GiftedChat will no longer manage its own internal text state...
    Downloads: 5 This Week
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  • 9
    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...
    Downloads: 5 This Week
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    Inventors: Validate Your Idea, Protect It and Gain Market Advantages

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  • 10
    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. We believe in a medium of pure free trade, economies with fair, permission-less access and a world without intermediaries. We want to create policies that can exist between friends or scale globally, we want to communicate securely and be uninhibited by legacy systems.
    Downloads: 0 This Week
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  • 11
    Element Android

    Element Android

    A glossy Matrix collaboration client for Android

    Element Android is a glossy Matrix collaboration client for Android, based on a new Android SDK fully written in Kotlin. A total rewrite of Riot-Android, Element is an all-in-one secure chat app made possible through the open global Matrix network. It is a messenger that allows users to talk to anyone regardless of their app, while providing unparalleled privacy and security. It protects conversations from data-mining and ads with proper end-to-end encryption, so you can feel totally...
    Downloads: 6 This Week
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  • 12
    Session for Android

    Session for Android

    A Decentralized, Onion Routed, Private Messenger

    Session Android is the official mobile client for Session, a privacy-first messaging protocol that enables secure, anonymous messaging without requiring phone numbers, email addresses, or centralized user accounts. Built natively for Android, the app lets users send and receive end-to-end encrypted text messages, voice notes, images, and attachments in both one-on-one and group chats, all while routing data through a decentralized onion-routing network designed to protect not just message...
    Downloads: 11 This Week
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  • 13
    Session for iOS

    Session for iOS

    A Decentralized, Onion Routed, Private Messenger

    Session iOS is the native iPhone and iPad client for the Session secure messaging ecosystem, engineered to bring private, anonymous communication to Apple’s mobile platforms without relying on phone numbers or email addresses. The app supports encrypted one-on-one and group chats, voice messages, file and image sharing, and threaded conversations, all delivered over a decentralized onion network designed to conceal metadata such as sender identity, message timing, and network path. On iOS,...
    Downloads: 4 This Week
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  • 14
    SmsForwarder

    SmsForwarder

    Monitors Android mobile phone text messages, calls, and notifications

    SmsForwarder is an Android application designed to monitor incoming communications such as SMS messages, phone calls, and app notifications, and then automatically forward them to configured destinations based on user-defined rules, making it ideal for remote monitoring, backup, or automation scenarios. Users can set custom logic so that certain messages or notifications trigger forwarding to group chat bots (like DingTalk or enterprise WeChat), webhook endpoints, email, push services...
    Downloads: 3 This Week
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  • 15
    Signal Server

    Signal Server

    Server supporting the Signal Private Messenger applications on Android

    Signal Server is the official backend server component that supports the Signal Private Messenger ecosystem on Android, iOS, and desktop platforms, serving as the trusted message relay, contact discovery, and push notification hub while the clients handle end-to-end encryption. Built in Java and licensed under the AGPL-3.0 license, this server software handles protocols for delivering encrypted messages, synchronizing user metadata like public keys and push tokens, and providing REST and...
    Downloads: 8 This Week
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  • 16
    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. Berty is end-to-end encrypted - not even our...
    Downloads: 2 This Week
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  • 17
    Element X Android

    Element X Android

    Android Matrix messenger application using the Matrix Rust SDK

    Element X Android is a modern, reimagined Matrix-protocol client designed for Android that provides secure, decentralized communication with a focus on performance, polished UI, and extensibility. Built as the successor to earlier Matrix clients, Element X blends fast native Android development with a feature-rich experience that supports end-to-end encrypted messaging, voice and video calls, threaded conversations, and file sharing across federated Matrix servers. Unlike proprietary...
    Downloads: 7 This Week
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  • 18
    Telegram for Android

    Telegram for Android

    Telegram messenger for Android

    Telegram is a wonderful and private messaging app that offers simple, fast, secure and synced messaging for all your devices. It delivers messages faster than any other application; cloud-based so you can access your messages from any device; and very secure, with messages heavily encrypted and could even self-destruct. Telegram is simple and fun to use, with powerful photo and video editing tools as well as an open sticker/GIF platform to let you express yourself fully. It’s also...
    Downloads: 7 This Week
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  • 19
    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. Privacy is not an optional mode, it is how Signal works. In all your messages, all your calls,...
    Downloads: 19 This Week
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  • 20
    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,...
    Downloads: 0 This Week
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  • 21
    bitchat

    bitchat

    bluetooth mesh chat, IRC vibes

    bitchat is a decentralized peer-to-peer messaging app that operates over Bluetooth mesh networks, enabling local group chats without the need for internet, servers, or phone numbers. It is designed with privacy and security in mind, offering encrypted private messages and channels alongside a public local chat that requires no registration.
    Downloads: 79 This Week
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  • 22
    gSOAP Toolkit

    gSOAP Toolkit

    Development toolkit for Web Services and XML data bindings for C & C++

    The gSOAP toolkit is an extensive suite of portable C and C++ software to develop XML Web services with powerful type-safe XML data bindings. Easy-to-use code-generator tools allow you to directly integrate XML data in C and C++. Serializes native application data in XML. Includes WSDL/XSD schema binding and auto-coding tools, stub/skeleton compiler, Web server integration with Apache module and IIS extension, high-performance XML processing with schema validation, fast MIME/MTOM streaming,...
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    Downloads: 463 This Week
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  • 23
    Toxic

    Toxic

    A Tox-based instant messaging and video chat client

    ...It includes features such as text messaging, file transfer, and audio calls—all without requiring user accounts or central servers. Toxic is designed for power users who prefer a minimalist interface, operating entirely within a terminal while delivering strong privacy through the Tox peer-to-peer protocol. It’s lightweight, fast, and ideal for use in low-resource or remote systems.
    Downloads: 2 This Week
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  • 24
    EthChat Pro

    EthChat Pro

    PHP driven chat forum

    EthChat Pro is designed as a solution for self hosted chat on a shared hosting server. No server side knowledge is required to use EthChat Pro. ll you need is a way to upload files to your shared hosting plan. Following the included README will walk you through the rest.
    Downloads: 0 This Week
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  • 25
    BluNet

    BluNet

    BluNet is a Bluetooth Messaging Application for Android devices

    BluNet is a Bluetooth Messaging Application for Android devices 7.0 and above. It enables paired devices to send and receive messages via Bluetooth. It occupies minimal space, has a clean minimalistic interface and messages resemble the 1980s style green text. It does not collect any data, or even store any chats permanently, nor does it ask for notification permissions. It is a simple fun to use application, to discover the versatility of the only point to point mode of communication...
    Downloads: 2 This Week
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