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awesome-selfhosted
A list of Free Software network services and web applications which can be hosted on your own servers
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QEMU
Official QEMU mirror. Please see https://www.qemu.org/contribute/ for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website.
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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.
Check this list on Github: awesome-selfhosted
And there's so many more (Qemu, or Parallells perhaps if yer a Mac person)... many folks probably could get their hands on a spare PC to set in a corner, Pi-hole (or a basic web/file server/NAS) can be built from a repurposed PC. Best of luck, you can literally make a career out of this stuff.