Zulip

medium

Threaded team chat that combines real-time messaging with email-like topic threading.

2 GB RAM Docker Active Apache-2.0 iOS & Android

Source Docs Website

Replaces

Pros

Unique topic-based threading model
Great for async communication
Fully open source with no paid tiers for self-hosted
Excellent search

Cons

Threading model has a learning curve
Fewer integrations than Slack
Smaller community
UI feels dated compared to alternatives

Tags

messaging team-chat threaded topics

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