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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.
During the pandemic, some online chat groups have popped up as well, mostly on Zulip. It sounds like you're looking for some community, so these would be good for catching up and integrating yourself back into the community.
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.