Signal
Open-source text, voice and video messaging app supported entirely by grants and donations
Ethical Alternatives & Resources
Messaging
Zom
Open-source messenger app created by a group of friends with an interest in Tibetan culture
Jami
Community-powered Jami aims to provide a universal communication tool
Rocket.Chat
Open-source team communication to replace email and Slack
Riot.im
Slack alternative that allows you to run your own server
Delta Chat
Like Telegram or Whatsapp, but without tracking or central control
Silence
SMS/MMS encryption made easy
Briar
Peer-to-peer encrypted messaging and forums
Tox
Made by people fed up with apps that spy on us, track us and censor us
Conversations
Jabber/XMPP client for Android 4.0+ smartphones
Matrix
Open network for secure, decentralised communication
Telegram
Fast and secure cloud-based messaging
Stealthy
Decentralised, end-to-end encrypted, communication protocol
Librem Chat
End-to-end encrypted chat, VOIP, and video calling
UpRing
Privacy conscious, device-to-device contacts app