Open Source Tox Alternatives for Android
There are many alternatives to Tox for Android if you are looking to replace it. The most popular Android alternative is 
Telegram, which is free. If that doesn't suit you, our users have ranked more than 100 alternatives to Tox and loads of them are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to Tox are 
Signal (Free, Open Source), 
Discord (Freemium), 
Element (Freemium, Open Source) and 
Jitsi (Free, Open Source).
- Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real time with all your friends at once, and share media or attachments...
- A free instant messaging and collaboration software based on the Matrix protocol.GuRiot.im uses Jitsi for conference video calls, which are not end-to-end encrypted, they can be registered by the Jitsi Videobridge.joDecentralized messenger which supports audio and video calling as well as group chats and offline messaging.
Federated, though not completely P2P, and a pain to set up. - Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!
- Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure...
- Voice, video and chat communications, secure, decentralized, strong privacy and freedoms.
- Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography.
- Zulip is a group chat app in which messages are threaded by topic, helping you have long-running, organized conversations.
- Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].[Note]
- Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
- Session is the world's first open-source, decentralised private messenger to use industry-leading Signal Protocol encryption — without asking for your phone number.