Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.

Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…

Threema is an encrypted instant messaging application for iOS, Android and Windows Phone.

BlackBerry Messenger, also known as BBM is an instant messenger and videotelephony application included on BlackBerry devices that allows messaging and voice …

Sicher is a freeware instant messaging application for iOS, Android, and Windows Phone. Sicher allows users to exchange end-to-end encrypted text messages, me…

Zulip is a chat and collaborative software.

RetroShare is open source software for encrypted filesharing, serverless email, instant messaging, online chat, and BBS, based on a friend-to-friend network b…

Minds is an open source social networking service.

TorChat is a decentralized anonymous instant messenger that uses Tor hidden services as its underlying network. It provides cryptographically secure text mess…

Conversations is an open source XMPP/Jabber client for the Android platform.

Otr.to is a browser based chat client.

Pidgin-Encryption transparently encrypts your instant messages with RSA encryption.