Open Source Kotlin Communications Software
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Kotlin Communications Software
View 5353 business solutionsBrowse free open source Kotlin Communications Software and projects below. Use the toggles on the left to filter open source Kotlin Communications Software by OS, license, language, programming language, and project status.
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WhatsApp clone app
WhatsApp clone project demonstrates modern Android development
This is a WhatsApp clone app built with Stream Chat SDK for Compose to implement messaging systems and Stream Video SDK for Compose using Jetpack Compose. -
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SimpleX
The first messaging platform operating without user identifiers
Other apps have user IDs: Signal, Matrix, Session, Briar, Jami, Cwtch, etc. SimpleX does not, not even random numbers. This radically improves your privacy. The video shows how you connect to your friend via their 1-time QR-code, in person or via a video link. You can also connect by sharing an invitation link. Temporary anonymous pairwise identifiers SimpleX uses temporary anonymous pairwise addresses and credentials for each user contact or group member. It allows to deliver messages without user profile identifiers, providing better meta-data privacy than alternatives. Many communication platforms are vulnerable to MITM attacks by servers or network providers. To prevent it SimpleX apps pass one-time keys out-of-band when you share an address as a link or a QR code. Double-ratchet protocol. OTR messaging with perfect forward secrecy and break-in recovery. NaCL cryptobox in each queue to prevent traffic correlation between message queues if TLS is compromised. -
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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 messaging apps, Element X connects to any compliant Matrix server, letting individuals host their own or join communities without centralized control, while still benefiting from robust cryptographic protections that ensure only intended recipients can read conversations. The app’s UI emphasizes responsiveness and ease of use with modern navigation patterns, customizable themes, and intuitive controls for group chats and spaces (Matrix’s equivalent of servers or room collections). -
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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 (PushPlus, Bark), Telegram bots, and other channels, allowing flexible integration with communication workflows. In addition to basic forwarding, the app’s rule-based engine can filter messages, enabling selective forwarding based on content, sender, or event type, and it can even push details like call logs or device battery status. The tool’s functionality extends to remote control features, which allow a paired server or client to query messages, calls, contacts, and more. -
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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. -
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Meshenger
P2P Voice/Video phone App for local networks
Meshenger is an open-source, serverless P2P voice and video calling app for Android that works over local networks or directly between devices without the internet. It facilitates direct communication using QR codes or IP addresses, bypassing the need for any central infrastructure or account registration. Meshenger is particularly suited for emergency scenarios, privacy-focused users, and mesh networks where conventional communication tools fail. It emphasizes minimalism, transparency, and full decentralization. -
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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 content but also metadata like sender ID, timing, and network location. The Android client integrates seamlessly with Android’s notification system and background services so that you can stay connected without exposing your identity or compromising privacy, and it supports features such as message reactions, search within chats, profile and contact management, and local message storage encrypted at rest. -
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QKSMS
A beautiful SMS messenger for Android
Fall in love with texting all over again with QKSMS! QKSMS is a beautiful, simple and customizable open source replacement to the stock messaging app on Android. It's got a clean, clutter-free intuitive design that lets you focus on what matters, plus millions of colors to choose from to make the theme of the entire app truly your own. QKSMS has some powerful features, including photo sharing, group chat, conversation blocking, message backup and restore and more. It's got everything you need from a text messaging app, plus all the fun features that make for a great text messaging experience. Simply put, QKSMS makes texting magical again, just the way it should be! -
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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 using their Facebook credentials. Enable people to post to Facebook from your app. People can share, send a message, and share to stories. Understand people's actions in your app and measure the effectiveness of your Mobile App Ads. Get data in and out of Facebook's social graph, query data, post stories, upload photos and perform other tasks. -
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Rocket.Chat Android
Legacy mobile Rocket.Chat client in Kotlin for Android
Rocket.Chat is a free and open-source team chat collaboration platform that allows users to communicate securely in real-time across devices on the web, desktop or mobile and to customize their interface with a range of plugins, themes and integrations with other key software. By opting for Rocket.Chat, users also benefit from free audio and video conferencing, guest access, screen and file sharing, LiveChat, LDAP Group Sync, two-factor authentication (2FA), E2E encryption, SSO, dozens of OAuth providers and unlimited users, guests, channels, messages, searches, and files. Users can set up Rocket.Chat on the cloud or by hosting their own servers on-premises. -
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Thunderbird for Android
Open Source Email App for Android (fka K-9 Mail)
Thunderbird Android is the mobile counterpart of the popular Thunderbird email client, reimagined for Android phones and tablets so users can access, send, and organize email from multiple accounts with advanced features found in desktop clients. It embraces modern mobile UI design while supporting robust email protocols (IMAP/POP3) and standards like OAuth for secure logins to services such as Gmail, Outlook, or custom mail providers. The app is built to handle complex mailbox structures, threaded discussions, rich text and HTML content, attachments, and account synchronizations reliably even on cellular connections. With features like unified inboxes, background fetch, push notifications, and configurable swipe actions, Thunderbird Android aims to bring the power and flexibility of the desktop experience to your pocket. It also integrates search, filtering, and tagging capabilities that help users stay organized when managing large volumes of mail. -
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CatchUp
An app for catching up on things
In today's world we are constantly overwhelmed with content and services from different media platforms and apps. It's difficult to take in all of these in one go, but skipping any of them could mean falling behind on the latest news and developments. Enter CatchUp: an app for catching up on things. CatchUp offers a high level presentation of the "front page" of several services in short form, allowing you to take in these services in one swift go. And when you want to go further, there's intelligent deeplinking into dedicated apps that will allow you to do so. CatchUp features several services but is not an all-purpose client for each of these services, nor does it support login for any service, or the customization/filtering of their feed. It will simply display the front page of a number of different services in a per-service-themed, consistent, at-a-glance UI. -
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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 secure. Element is used by millions all over the world for their business, organizations, and even for personal and home use. It is part of the Matrix ecosystem, which is an open network for secure, decentralised communication governed by The Matrix.org Foundation. -
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Proton Mail for Android
Proton Mail Android app
Proton Mail for Android is the official mobile application that lets users access their Proton Mail encrypted email accounts securely on Android devices, providing the full suite of messaging features while preserving end-to-end encryption and user privacy. Designed for modern Android phones and tablets, the app lets users send, receive, organize, and search encrypted emails, create new Proton accounts, manage multiple accounts, and apply labels or folders to keep messages tidy — all within a responsive, touch-optimized interface. It supports composing messages, viewing attachments, handling contacts, and configuring account and mail settings from within the app, giving users portable access to their secure inbox wherever they go. Because ProtonMail’s service never sees unencrypted content, the Android client performs necessary encryption and decryption on the device, aligning with Proton’s privacy-first philosophy and open-source security model. -
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UDEX
Secure and Decentralized Exchange + Wallet for Ethereum ERC20 tokens
We believe that private property is untouchable and market access is unconditional. That is why we engineered a crypto exchange that is equally open to all, lives online forever and unconditionally protects your assets. It is fully peer-to-peer and works without any centrally managed servers. It can't be stopped, blocked or taken down. Such an approach enables the wallet to operate anywhere and remain censorship-resistant. Only the user is in control of the money. Wallet-to-wallet token trading is the most secure way to trade ERC20 tokens directly from your Ethereum wallet. Trading cryptocurrencies doesn't have to mean losing custody. Use UDEX to maintain control of your ERC20 tokens while trading directly from your wallet. Trade when you want, where you want, without a middleman. -
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WAN-Transfer — Easy WebDAV File Share
Share local folders online via WebDAV with UI and instant tunneling
WAN-Transfer is a lightweight WebDAV server with a simple UI that makes it easy to share folders from your PC across your local network — or over the internet using built-in tunnel services. With no setup required, you can expose any local directory via a public WebDAV link and mount it directly in Windows Explorer or any WebDAV client. Choose your tunnel provider (LocalTunnel, Serveo, localhost.run, Cloudflared) and instantly make your server accessible from anywhere — no port forwarding or firewall tweaks needed. The clean interface makes it effortless to configure ports, select directories, and copy access links. Whether you're sharing files with others, setting up remote access, or just testing ideas, WAN-Transfer makes it easy to serve content directly from your machine. Built with modularity in mind, WAN-Transfer is designed to support additional tunnel services and sharing options in future updates. -
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Talkufy brings you everything you need. From chatting, video calling (Beta), translating messages, group chats and lots more.
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Amazon Chime SDK for Android
An Android client library for integrating multi-party communications
The Amazon Chime SDK for Android makes it easy to add collaborative audio calling, video calling, and screen share viewing features to Android applications by using the same infrastructure services that power meetings on the Amazon Chime service. This Amazon Chime SDK for Android works by connecting to meeting session resources that you have created in your AWS account. The SDK has everything you need to build custom calling and collaboration experiences in your Android application, including methods to: configure meeting sessions, list and select audio devices, switch video devices, start and stop screen share viewing, and receive callbacks when media events occur such as volume changes, and manage meeting features such as audio mute and video tile bindings. We also have an Amazon Chime SDK Project Board where you can find community requests and their statuses. -
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Android Upload Service
Easily upload files in the background with progress notification
Easily upload files (Multipart/Binary/FTP out of the box) in the background with progress notification. Support for persistent upload requests, customizations and custom plugins. At the core of the library, there is a Service that handles multiple concurrent upload tasks in the background. It publishes broadcast intents to notify status. This way the logic is completely decoupled from the UI. You are safe launching upload requests from your fragments, activities and services without worrying about locking the thread in which you are. Check the wiki to learn how you can use it in your App. You are also safe if your app is put in the background. All the uploads will continue to be executed also when your device is idle. Bear in mind that if you kill your app, the service gets killed as well, as it's attached to your app's process and all the currently running uploads will be terminated abruptly. -
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Confetti
KMP GraphQL based conference project with Jetpack Compose Android
Kotlin Multiplatform GraphQL project (backend and clients) to allow viewing of conference information for a range of conferences. -
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Google I/O
Google I / O 2019 conference app
The Google I / O 2019 conference app is your co-pilot for exploring the conference, whether you attend in person or remotely. With the app you can explore the entire conference program, with details about the topics and speakers, save events to the agenda, your personalized program, receive reminders before the events you saved to the agenda begin, synchronize your program personalized across all your devices and the I / O website, get oriented with the vector-based conference map, and agree to receive important notifications about the event, program, travel, evening activities, session recordings and much more. The source code for the app will be available shortly after the I / O conference. -
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Kotlin Telegram Bot
A wrapper for the Telegram Bot API written in Kotlin
A wrapper for the Telegram Bot API written in Kotlin. -
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News App
A sample News app built using Modern Android Development
News App is a simple news app that uses NewsAPI to fetch top news headlines from the API. The main aim of this app is to be a leading example of how to build Modern Android applications for all Android Developers. The idea is to keep the app super simple while demonstrating new libraries and tools which makes it easier to build high-quality Android applications. -
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Read You
An Android RSS reader presented in Material You style
An Android RSS reader presented in Material You style. -
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ReadYou
An Android RSS reader presented in Material You style
ReadYou is a modern, open-source RSS reader for Android focused on minimalism, usability, and privacy. It supports standard RSS/Atom feeds, OPML import/export, and allows for offline reading. Built with Jetpack Compose, ReadYou offers a polished and intuitive user experience without background sync or data tracking.
