... I send out a list of most interesting libraries and apps in the "C++" section to about 1100 subscribers.
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Index database library for use with sourcekit-lsp
C++ string_view extension library.
Error-Free Transformations as building blocks for compensated algorithms
Embedded Multicore Building Blocks (EMB²): Library for parallel programming of embedded systems. Star us on GitHub? +1
Official Threading Building Blocks (TBB) GitHub repository. For Commercial Intel TBB distribution, please click here: https://software.intel.com/en-us/tbb
Source Code for 'Pro TBB: C++ Parallel Programming with Threading Building Blocks' by Michael Voss, Rafael Asenjo, and James Reinders
Building Blocks of Application Development with C++ [Video], Published by Packt
MediaPipe is a cross-platform framework for building multimodal applied machine learning pipelines