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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
If you want an alternative to Twitter you can use Mastodon. Mastodon and all three above can federate, so you can exchange messages between them whilst using the same identity: https://joinmastodon.org/ .
Friendica (open source, dunno that much about it, thought it was dead but it is not): https://friendi.ca/ .
*diaspora (totally open, interoperable and looks a bit like FB, missing a groups feature): https://diasporafoundation.org/
I feel like what they are looking for is basically discord, and if you want a good private open source alternative look into https://element.io
Followed this. https://github.com/mriedmann/humhub-docker