Native Discord client
Multiplayer Collaboration
Open-source, low-latency, high quality voice chat software for gaming
Standalone IRCCloud desktop client
Desktop client for Android Messages
Unofficial Pushbullet desktop app to get push notifications
Email client focusing on privacy protection
Instant messaging application designed for the XMPP network
XMPP client designed for experienced users
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IRC client
Quassel IRC: Chat comfortably. Everywhere
IM client for Matrix
Social streaming app
Keep your streaming chats in one place
VOIP and message application
Video conferencing, screen sharing, and team messaging platform
Phone system manager
Team communication and collaboration software
Matrix client based on Element with a more traditional IM experience
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Development of SeaMonkey Internet Application Suite
Mastodon and Pleroma desktop client
Video chat, voice call and instant messaging application
Microsofts instant messaging enterprise software