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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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awesome-selfhosted
A list of Free Software network services and web applications which can be hosted on your own servers
If you want a reddit like experience, check out Lotide: https://github.com/lotide-org/lotide
If you want something more realtime-ish, Matrix would be my go to.
Photos and photo handling will need to be handled out of band. There are several easy solutions here, especially if you are happy paying for an S3 clone.
Feel free to reach out to me and I can at least share my own setup.
there are forks of Mastodon as well. You might want to look at either the awesome-selfhosted github list or this watchlist for activitypub implementations:
https://github.com/awesome-selfhosted/awesome-selfhosted
https://git.feneas.org/feneas/fediverse/-/wikis/watchlist-fo...
I set up a Synapse/Matrix[0] server for my extended family and it works really well.
It can be accessed via most platforms, including mobile and web[1]
[0] https://matrix.org/docs/projects/server/synapse/
[1] https://element.io/