a modern C++ toolkit containing machine learning algorithms and tools for creating complex software in C++ to solve real world problems. - dlib.net

see also

• Tiny NN Framework

This is lib has a broad feature set:

• Image Processing
  • pixel type: 24bit RGB pixel
  • Visualization
    • draw line
    • draw rectangle
    • draw circle

• Graphical User Interfaces

• Machine Learning Algorithms
  • see also Neural-network
• Numerical Algorithms

• Graphical Model Inference Algorithms

• Threading
• Networking
• Data Compression and Integrity Algorithms
• General Utilities