Introduction to Machine Learning C++ Libraries, published by Packt
Deep Learning Library (DLL) for C++ (ANNs, CNNs, RBMs, DBNs...)
A C++ standalone library for machine learning
header only, dependency-free deep learning framework in C++14
Deep reinforcement learning GPU libraries for NVIDIA Jetson with PyTorch, OpenAI Gym, and Gazebo robotics simulator.
cuML - RAPIDS Machine Learning Library
mlpack: a scalable C++ machine learning library --
Basic Development Environment - a set of foundational C++ libraries used at Bloomberg.