Telegram is a free cloud-based instant messaging platform.

Signal is the most scalable encryption tool.

Gajim is an instant messaging client for the XMPP protocol which uses the GTK+ toolkit.

Bitmessage is a decentralized, encrypted, peer-to-peer, trustless communications protocol that can be used by one person to send encrypted messages to another…

Wickr is an instant messenger application.

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…

Off-the-Record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations.

Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.

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