Telegram is a free cloud-based instant messaging platform.

ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol.

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

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…

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…

iMessage is an instant messaging service.

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

Wickr is an instant messenger application.