Open Source

Pidgin is a free and open-source chat client which supports AIM, Google Talk, ICQ, XMPP protocols.

Open Source

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

Tox

Open Source

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

Signal

Open Source

Signal is the most scalable encryption tool.

TeamSpeak

Freemium

TeamSpeak is software for quality voice communication via the Internet.

Wire

Free

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

Open Source

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

Wickr

Free

Wickr is an instant messenger application.

Toky

Freemium

Toky is an automation platform.

Free

Telegram is a free cloud-based instant messaging platform.

Mumble

Open Source

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

Trillian

Freemium

Trillian is a proprietary multiprotocol instant messaging application.

Jitsi

Open Source

Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.

RetroShare

Open Source

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

Ring

Open Source

Ring (SFLphone) is an open-source SIP-compatible softphone and instant messenger for Linux, Microsoft Windows, OS X and Android.

Bitmessage

Open Source

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