iOS (Electronic resource) 12 Application software 11 Development 11 C# (Computer program language) 5 Mobile apps 4 Object-oriented programming languages 2 Android (Electronic resource) 1 Cloud computing 1 Computer programs 1 Electronic commerce 1 Geographic information systems 1 Multimedia systems 1 Object-oriented programming (Computer science) 1 Open source software 1 Programming 1 Web sites 1 iCloud 1 iPad (Computer) 1 iPhone (Smartphone) 1