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Rocket.Chat
Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.
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Pumble
A curated collection of the best open source alternatives to Pumble. Each listing includes a website screenshot along with a detailed review of its features.
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Best matching open-source options
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Mattermost
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.
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Zulip
Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.
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Element
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.
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Stoat
Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.
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Fluxer
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
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Campfire
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.
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Twake Chat
Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.
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