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Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
I don't personally use it but I've seen MatterMost mentioned here on occasion. There is a Docker Image to self host it.
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They have an entire page on Github for running RocketChat on a Pi. It's not the Docker version, but as the other comment says there is probably a non-official ARM image of it.
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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.
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.