Adium is an Open source multi-protocol instant messaging client for Mac OS X, supports MSN, Jabber, Yahoo! and other networks.

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

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

Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Empathy is an instant messaging (IM) and voice over IP (VoIP) client which supports text, voice, video, file transfers, and inter-application communication ov…

Linphone is a free voice over IP (VoIP) service and SIP client.

Bit Chat is a secure, peer-to-peer, open source instant messenger with end-to-end encryption.

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

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

Discord is a freeware proprietary VoIP application designed for gaming communities.

Firefox Hello is a discontinued built-in video chat client for Firefox browser.

Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming.