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#2 Signal
End‑to‑end encrypted messaging app with voice/video calls, open‑source client, and strong privacy focus.
Feature‑rich client for the Matrix protocol; supports encrypted group chats, VoIP, and bridges to other networks.
#4 Rocket.Chat
Open‑source team chat platform with real‑time messaging, file sharing, and optional self‑hosting.
#5 Mattermost
Self‑hosted, open‑source Slack‑like workspace offering private channels, integrations, and end‑to‑end encryption (via plugins).
#6 Zulip
Threaded open‑source chat that combines real‑time and asynchronous messaging for organized discussions.
Decentralised, peer‑to‑peer messenger and video‑conference tool with no central server.
#8 Wire
Secure, end‑to‑end encrypted messaging and collaboration suite with file sharing and voice/video calls.
#9 Telegram
Cloud‑based messenger offering secret chats with end‑to‑end encryption, large group support, and bots.
#10 Discord
Free tier provides text/voice channels, community servers, and screen‑share; encryption in transit.
Popular team communication tool; free plan includes searchable message history and limited integrations.
#12 Conversations
Android XMPP client with OMEMO encryption, group chat, and push‑notification support.
#13 Pidgin
Multi‑protocol desktop client (IRC, XMPP, AIM, etc.) with plugins for encryption and OTR.
#14 Briar
Peer‑to‑peer messenger designed for activists; works over Bluetooth, Wi‑Fi, or the internet with strong encryption.
#15 Delta Chat
Uses existing email infrastructure as a chat backend; supports end‑to‑end encryption via Autocrypt.
#16 Keybase
Secure messaging, file sharing, and Git hosting built around public‑key identities.
#17 Mumble
Low‑latency, open‑source voice chat primarily for gaming; supports encrypted connections.
#18 Gajim
Cross‑platform XMPP client with support for OMEMO, group chats, and file transfers.
Former branding of Element; still referenced in many tutorials and older installations.
#20 KDE Telepathy
Integrated instant‑messaging suite for KDE desktops; supports multiple protocols via Telepathy framework.
#21 Miranda IM
Lightweight, extensible Windows messenger supporting dozens of protocols through plugins.