Zulip | Open source Slack alternative

zulipchat.com

Zulip combines the immediacy of real-time chat with an email threading model. It's got hundreds of integrations (like Slack) but also does markdown formatting, threading, and more. You can use their hosted version for free up to 10,000 messages search history (similar to Slack), then either pay $8/month per user or go self-hosted since it's open source.

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