Qt

Qt is a powerful cross-platform application library which is ideal for connected devices. In Sailfish OS systems it serves as the main application development environment and provides consistent APIs into most other commonly used device functions. Sailfish currently uses Qt version 5.6.

The following modules are used within Sailfish OS:

QtCore
QtWebkit
QtDBus
QtGui
QtLocation
QtPositioning
QtMultimedia
QtNetwork
QtQuick
QtQml
QtSensors
QtSql
QtSvg
QtXml
QtXmlPatterns

There are many other Qt modules which are not used; most are obvious but these are worth noting:

QtScript
QtOpengl
QtQuickWidgets
qtWidgets