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boost(boost.org)
From wikipedia, Boost is a set of libraries for the C++ programming language that provides support for tasks and structures such as linear algebra, pseudorandom number generation, multithreading, image processing, regular expressions, and unit testing. It contains 162 individual libraries( as of version 1.73).
Most of the Boost libraries are licensed under the Boost Software Lincense, designed to allow Boost to be used with both free and proprietary software projects. Many of the Boost’s founders are on the C++ standards committee, and several Boost libraries have been accepted for incorporation into the C++ Technical Report 1, the C++ 11 standard (e.g. smart pointers, thread, regex, random, ratio, tuple) and C++ 17 standard (e.g. filesystem, any, optional, variant, string_view)
The libraries are aimed at a wide range of C++ users and application domains. They range from general-purpose libraries like the smart pointer library, to operating system abstractions like Boost FileSystem, to libraries primarily aimed at other library developers and advanced C++ users, like the template metaprogramming (MPL) and domain-specific language (DSL) creation (Proto).