C++ (Computer program language) Object-oriented programming (Computer science) 9 Data structures (Computer science) 4 C (Computer program language) 2 Computer software 2 Graphical user interfaces (Computer systems) 2 Java (Computer program language) 2 Qt (Electronic resource) 2 UML (Computer science) 2 Computer networks 1 Computer programming 1 Development 1 Generic programming (Computer science) 1 Microsoft Visual C++ 1 Reusability 1 Software engineering 1 Software patterns 1 Standard template library 1