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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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Campsite
A curated collection of the best open source alternatives to Campsite. Each listing includes a website screenshot along with a detailed review of its features.
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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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Wire
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.
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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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