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#2 Discord
Free voice, video, and text chat for communities; supports servers, screen‑share, and bots.
Team collaboration hub with channels, direct messages, and integrations; free plan includes 10 k recent messages.
Low‑latency voice communication for gamers; free for up to 32 users on a self‑hosted server.
#5 Rocket.Chat
Open‑source chat platform with real‑time messaging, video calls, and extensive customization.
#6 Mattermost
Self‑hosted, open‑source Slack alternative offering channels, direct messages, and integrations.
#7 Zulip
Threaded open‑source chat that combines real‑time and asynchronous communication.
Secure, federated messenger built on the Matrix protocol; supports end‑to‑end encryption and VoIP.
#9 Telegram
Cloud‑based messaging app with group chats, voice calls, and bots; free for unlimited users.
#10 Signal
Privacy‑focused messenger offering end‑to‑end encrypted text, voice, and video calls.
#11 Jitsi Meet
Open‑source video‑conferencing platform with built‑in chat and screen‑share; no account required.
#12 Tox
Decentralized, peer‑to‑peer messenger with encrypted text, voice, and video.
#13 Wire
Secure collaboration suite offering encrypted messaging, voice, and video calls for teams.
#14 Keybase
Encrypted chat and file sharing tied to public‑key identities; includes voice and video calls.
Classic Internet Relay Chat protocol; HexChat provides a modern, free desktop client.
#16 Gitter
Chat and community platform for developers, integrated with GitHub and GitLab.
#17 Riot.im (legacy)
Former name of Element; still available as a standalone client for Matrix networks.
#18 Jami
Free, decentralized communication tool offering secure text, voice, and video without servers.
Open‑source instant messenger for the KDE desktop, supporting multiple protocols and encrypted chats.
While Mumble itself is the reference, several community‑maintained forks (e.g., Murmur‑Enhanced) add extra features while staying free.
Free version of Teams provides chat, voice, and video meetings for up to 100 participants.