Communication Apps
June 1, 2026 · View on GitHub
A curated list of open-source messengers, email clients, browsers, and other communication tools for Android. The list is sorted alphabetically.
| App Name | Description | Language | License | ⭐ Stars | Download |
|---|---|---|---|---|---|
| ChatSecure | A private and secure messaging app for Android and iOS. (Archived) | Java | Apache-2.0 | 1.1k | — |
| FairEmail | A fully featured, privacy-friendly open-source email app for Android. | Java | GPL-3.0 | 4.4k |  |
| httpSMS | Converts your phone into an SMS gateway with a simple, programmable API. | Go | AGPL-3.0 | 2.0k |  |
| IRCCloud | The official open-source Android application for IRCCloud.com. | Java | Apache-2.0 | 306 | |
| K-9 Mail | An advanced, open-source email client for Android. | Kotlin | Apache-2.0 | 13.5k | |
| KissProxy | An NIO-based local HTTP/HTTPS proxy for Android. (Archived) | Java | Apache-2.0 | 121 | — |
| Kontalk Messenger | The official Android client for the Kontalk instant messaging network. | Java | GPL-3.0 | 578 | — |
| KouChat | A serverless LAN chat application for local network communication. | Java | GPL-3.0 | 97 | |
| MaterialQQLite | A Material Design-style client for the QQ messaging service. (Archived) | Java | Apache-2.0 | 128 | — |
| Messaging (Odoo) | The official mobile messaging client for the Odoo platform. | Java | GPL-3.0 | 62 | — |
| ProxyDroid | A global proxy application for Android devices. | Kotlin | GPL-3.0 | 2.5k | — |
| QKSMS | An open-source replacement for the stock Android messaging (SMS/MMS) app. | Kotlin | GPL-3.0 | 4.6k | |
| Rocket.Chat | A self-hostable, Slack-like online chat platform. | TypeScript | MIT | 45.4k | — |
| RTranslator | The world's first open-source simultaneous translation app. | C++ | Apache-2.0 | 10.1k | — |
| Signal | A private messenger for secure calling and messaging. | Kotlin | AGPL-3.0 | 28.9k | |
| Silence | A privacy-focused SMS/MMS application that uses end-to-end encryption. | Java | GPL-3.0 | 1.1k | — |
| surespot | A mobile messaging app that secures messages with end-to-end encryption. | Java | GPL-3.0 | 511 | |
| TeamTalk (mogujie) | The official Android client for the mogutt TeamTalk service. (Archived) | Java | Apache-2.0 | 736 | — |
| Telegram | The official, open-source Android client for the Telegram messaging service. | Java | GPL-2.0 | 29.3k | |
| Tint Browser | A lightweight, open-source web browser for Android 4.0 and above. | Java | GPL-3.0 | 223 | — |
| Tutanota | An end-to-end encrypted email client focused on security and privacy. | TypeScript | GPL-3.0 | 7.6k | |
| Ulangi | A language learning app that uses spaced repetition and other popular methods. | TypeScript | GPL-3.0 | 457 | — |
| VideoFly | A video calling app that allows you to multitask during a call. (Archived) | Java | Not specified | 21 | — |
| WeChat (Clone) | A clone of the WeChat application. (Archived) | Java | Not specified | 5.5k | |
| WiFi Walkie Talkie | Transmits audio over a local WiFi network, acting like a walkie-talkie. | Java | Apache-2.0 | 161 | — |
| Wire | A secure messenger offering end-to-end encrypted communication. | Kotlin | GPL-3.0 | 244 | |
| Yaaic | "Yet Another Android IRC Client" for connecting to IRC networks. (Archived) | Java | GPL-3.0 | 336 | — |
| Zulip | The official Android client for the powerful open-source group chat platform. | Java | Apache-2.0 | 402 | — |
How to Contribute
Found an awesome open-source app that's missing? Feel free to open an issue or submit a pull request to add it!