| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| ChatSecureAndroid | The most private messaging for Android and iOS | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| FairEmail | Fully featured, open source, privacy friendly email app for Android | Java |  |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| httpSMS | httpSMS converts your Android phone into an SMS gateway so you can send and receive SMS messages via a simple programmable API with end-to-end encryption. | Kotlin |  |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| IRCCloud | The official Android app for IRCCloud.com | Java | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| K-9 Mail | K-9 Mail – Advanced Email for Android | Java | |
| KissProxy | NIO based android http&https local proxy. | Java | |
| Kontalk Messenger | Kontalk official Android client http://www.kontalk.org | Java | |
| KouChat | Serverless LAN chat application. http://www.kouchat.net/ | Java | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| MaterialQQLite | A material style of QQ (based on MingQQ) | Java | |
| messaging | Odoo Mobile Messaging Client. | Java | |
| mogujie TeamTalk | The android client of mogutt | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| ProxyDroid | Global Proxy for Android | C |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| qksms | QKSMS is an open source replacement to the stock messaging app on Android | java | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| Rocket.Chat | Have your own Slack like online chat, built with Meteor. https://rocket.chat/ | CoffeeScript | |
| RTranslator | World's first open-source simultaneous translation app. | Java | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| surespot | Surespot is a mobile messaging application that secures all messages using end-to-end encryption. https://www.surespot.me | Java | |
| Signal | A secure calling and messaging app for Android. | Java | |
| Silence | Silence (formerly SMSSecure) is an SMS/MMS application that allows you to protect your privacy while communicating with friends. | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| Tutanota | Tutanota is the end-to-end encrypted mail client that enables you to communicate securely with anyone. | JavaScript | |
| Telegram Messenger | Telegram Messenger for Android https://telegram.org/ | Java | |
| TintBrowser | Is an open-source browser for Android 4 and above | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| Ulangi | Learn languages using popular methods such as spaced repetition system | TypeScript | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| VideoFly | VideoFly is a video calling application which enables you to stay in a video call while using other applications. | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| It is a copy of WeChat developed by Tencent. |  |
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| WiFi Walkie Talkie | Simple application transmitting audio from mic to all devices running the same program on the same network segment. Use NSD for device discovery. | Java | |
| Wire | Messenger application that encrypts end to end communication. | Java | |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| Yaaic | Yaaic (Yet Another Android IRC Client) is as the name already says an Internet Relay Chat (IRC) client for Android devices. http://www.yaaic.org | Java |
| App Name | Describe | Major Language | Download |
|---|---|---|---|
| Zulip Android | Zulip Android app, Powerful open source group chat https://www.zulip.org/ | Java |