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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.
I have a repo https://gitlab.com/MartenBE/varia with a graph class and algorithms in C++, which I used when assisting some courses at uni. My goal was (and I still work on it from time to time) to present algorithms in C++ in a readable, modern C++ and unittested way. It is also a good way to keep my C++ up to date :) (Sorry for the shameless advertising)
This has quite a few graph algorithms for unweighted/weighted graphs/digraphs and flow networks: https://github.com/nspo/graphs-cpp
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