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

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

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

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.

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

Minds is an open source social networking service.

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

Otr.to is a browser based chat client.

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

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…

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