Mumble is an open‑source, low‑latency voice chat platform popular with gamers and remote teams. If you’re looking for free instant‑messaging (text, voice, or video) solutions that can replace or complement Mumble, the list below gathers 20 widely‑used alternatives—many of them open‑source or offering generous free tiers.
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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.
Open‑source chat platform with real‑time messaging, video calls, and extensive customization.
Self‑hosted, open‑source Slack alternative offering channels, direct messages, and integrations.
Secure, federated messenger built on the Matrix protocol; supports end‑to‑end encryption and VoIP.
Cloud‑based messaging app with group chats, voice calls, and bots; free for unlimited users.
Open‑source video‑conferencing platform with built‑in chat and screen‑share; no account required.
Secure collaboration suite offering encrypted messaging, voice, and video calls for teams.
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.
Former name of Element; still available as a standalone client for Matrix networks.
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.