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InfluxDB
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> That said, probably maintenance is not needed. I am not aware that anything in that field has changed for a long time.
To point out the bleeding obvious, it's not necessarily about the subject matter changing, but the technical environment. Systems change, libraries change with them, leading to potential compilation issues amongst other things.
A quick search on Github reveals troglobit/netcalc[1] as maintained clone of sipcalc.
[1]https://github.com/troglobit/netcalc
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