Open Source Kotlin Chat Software
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Kotlin Chat Software
View 152 business solutionsBrowse free open source Kotlin Chat Software and projects below. Use the toggles on the left to filter open source Kotlin Chat Software by OS, license, language, programming language, and project status.
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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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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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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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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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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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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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Kizzy
A Discord Rich Presence manager for Android fully written in Kotlin
Kizzy is an Android app for managing Discord Rich Presence from a mobile device. It is written in Kotlin and built with Jetpack Compose and Material 3 for a modern Android interface. The app lets users customize how their Discord activity appears by creating and managing rich presence configurations. It is aimed at people who want mobile control over status displays without needing a desktop RPC setup. The project includes documentation, translation support, build instructions, releases, and open-source licensing under GPL-3.0. Kizzy is useful for Android users who want a polished, configurable Discord presence manager with a native app feel. -
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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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Lavalink
Standalone audio sending node based on Lavaplayer
Lavalink is a standalone audio node for Discord music bots and other audio-driven bot systems. It is based on Lavaplayer and Koe and is designed to send audio without routing that audio through the bot’s own shards. This architecture helps larger bots separate audio playback from gateway logic and reduce load on the main bot process. Lavalink provides a REST API for resolving tracks, controlling players, managing playback, and retrieving statistics. It supports seeking, volume control, authentication, Prometheus metrics, Docker images, event handling, and plugin-based extensions. It is widely useful for developers building scalable Discord music bots that need reliable external audio playback infrastructure. -
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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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OpenCord
An open-source Material You implementation of the Discord Android app
OpenCord is an archived open-source Android client project that aimed to recreate Discord with a Material You interface. It was built in Kotlin and focused on bringing a more native Android design language to a Discord-style mobile experience. The project was still a work in progress and prioritized implementing stock client behavior before adding custom features. Its README clearly warns that the project is discontinued and that downloading the release APK may create Discord Terms of Service risk. OpenCord is best understood as a historical or experimental client implementation rather than a recommended daily-use app. It remains useful for developers studying Android, Jetpack Compose, Discord-like interfaces, and unofficial client architecture. -
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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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Talkufy brings you everything you need. From chatting, video calling (Beta), translating messages, group chats and lots more.
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Sandesh: Find your community
Home grown, community messaging platform
Sandesh: Find your community https://play.google.com/store/apps/details?id=com.pranjalstudioplus.sandesh We are thrilled to introduces an exciting new way to connect with your local community and engage in meaningful conversations. Here's what you can expect from this initial release: 1. Discover Local Communities: Find and join communities based on interests, passions, or proximity. 2. Authentic Answers to Local Problems: Get advice, share information, and find solutions from community members who understand local challenges. 3. Real-Time Messaging: Engage in personal chats, exchange ideas, and build relationships with like-minded individuals. 4. Secure and Reliable: Sandesh prioritizes privacy and data security for a trustworthy experience. Sandesh plans to continuously improve and enhance the platform based on user feedback. Future updates will introduce new features, community enhancements. Support: pranjalbarn@gmail.com -
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Tock
Tock, the open source conversational AI toolkit
Complete and autonomous NLU solution leveraging opensource libs, such as OpenNLP, Stanford, Duckling and more. Web, mobile, social networks, smart speakers and more. Create your bot once, connect it progressively to multiple channels as you need them. Simple graphical interfaces to build stories and models, manage multilingual and multichannel bots, better understand users with analytics. Program complex stories using Kotlin, Python or Node.js provided components, or integrate with any language by leveraging Tock APIs. Try Tock online, deploy in minutes using Docker running configurations, or setup your own platform to the Cloud, On-Premise, even embedded. More and more teams and companies trust in Tock and open conversational platforms. Built-in connectors for numerous text/voice channels, Messenger, WhatsApp, Google Assistant, Alexa, Twitter and more. -
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mastodon4kt
Mastodon Kotlin Library
This is based on https://github.com/sys1yagi/mastodon4j The project needs restructuring and updating.
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