Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2017. The current version is 1.89.0.
C/C++ Users Journal. February, 2006. “STL and TR1: Part III - Unordered containers”.
An introducation to the standard unordered containers.