Skype
Freemium
Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.
Telegram
Free
Telegram is a free cloud-based instant messaging platform.
Discord
Free
Discord is a freeware proprietary VoIP application designed for gaming communities.
Jitsi
Open Source
Jitsi (formerly SIP Communicator) is a free and open source multiplatform voice (VoIP), videoconferencing and instant messaging application.
I2P
Open Source
The Invisible Internet Project (I2P) is a garlic routing using overlay network and darknet that allows applications to send messages to each other pseudonymou…
Rocket.Chat
Open Source
Rocket.Chat free open source chat solution.
Conversations
Freemium
Conversations is an open source XMPP/Jabber client for the Android platform.
Zulip
Open Source
Zulip is a chat and collaborative software.
Wickr
Free
Wickr is an instant messenger application.
Hangouts
Free
Hangouts is an instant messaging software developed by Google.
WhatsApp Messenger
Free
WhatsApp Messenger is an instant messaging platform owned by Facebook.
Signal
Open Source
Signal is the most scalable encryption tool.
Glip
Freemium
Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.
Mattermost
Open Source
Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.
Xabber
Open Source
Xabber (XMPP and Jabber) is a XMPP client for the Android Operating System.
TribeScale
Free
TribeScale is an All-in-One platform to coordinate your team around what really matters - communication, goals, decisions, tasks and results.
Dialog Messenger
Free Personal
Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.
Gitter
Freemium
Gitter is an open source instant messaging and chat room system for developers and users of GitHub repositories.
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