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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
The package that I found most useful is Zulip. Probably overkill, https://github.com/zulip/zulip/
An easy way to start with is to use external Pusher channels service It requires 0 devops and everything works very well, for free at least at the beginning. However, like any external service, it can't scale without paying. "Pay as you grow".
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.