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CppCoreGuidelines
The C++ Core Guidelines are a set of tried-and-true guidelines, rules, and best practices about coding in C++
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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.
This is maybe one of the best pointer for you: http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines Sadly, it's really hard to find proper "modern C++" (let say: C++20 based using modules, uniform init etc.) projects available on the internet (e.g.: StackOverflow), which contributes to the bad reputation of the language...
An actual project: https://github.com/SerenityOS/serenity
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.