tagsslack
10.92

Rocket.Chat

The ultimate Free Open Source Solution for team communications.

10.58

metabase

The simplest, fastest way to get business intelligence and analytics to everyone in your company :yum:

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zulip

Zulip server and webapp - powerful open source team chat

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botkit

Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.

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outline

The fastest wiki and knowledge base for growing teams. Beautiful, feature rich, and markdown compatible.