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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.
and discourse may get federation support: https://github.com/discourse/discourse-activity-pub
https://github.com/nzbget-ng/nzbget I think
There's a lot chat about usenet so just as another thought it may be possible to use something like https://github.com/Koshroy/reddit-nntp to shunt off an archive into Usenet. Perhaps that will help persuade some people to move there. http://www.eternal-september.org is free for users to continue the banter.
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.