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freebsd-src
The FreeBSD src tree publish-only repository. Experimenting with 'simple' pull requests....
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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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src
Read-only git conversion of OpenBSD's official CVS src repository. Pull requests not accepted - send diffs to the tech@ mailing list.
Here is the repository: https://github.com/j-barnak/NakRouter
Beyond that, the RFCs are always useful, and lots of answers come from reading the system source code. I'm partial to the FreeBSD system source and the OpenBSD system source code where not dealing with something Linux-specific. To me, the Linux source code is harder to read because chasing a particular feature might mean looking through the kernel source, the glibc source, or the source for any number of other tools (probably iproute2 in your case) to figure out what's going on, and the BSDs keep all the source in one place.
Beyond that, the RFCs are always useful, and lots of answers come from reading the system source code. I'm partial to the FreeBSD system source and the OpenBSD system source code where not dealing with something Linux-specific. To me, the Linux source code is harder to read because chasing a particular feature might mean looking through the kernel source, the glibc source, or the source for any number of other tools (probably iproute2 in your case) to figure out what's going on, and the BSDs keep all the source in one place.