Here are the classes, structs, unions and interfaces with brief descriptions:

NQuasarAppUtils	The QuasarAppUtils namespace contains the base functions for all applications of the QuasarApp group. All methods of the QuasarAppUtils classes are static
CHumanReadableObject	The HumanReadableObject interface This is simple class that add one virtula method toString. All children object should be override this method
CISettings	The Settings class base interface for implementation settings backends. Available implementations: Setting (based on QSettings backend)
CLocales	For parese local files Example :
COptionData	Information about one option
CParams	Contains functions for working with input arguments and logs. This Class support next commandline arguments
CPlatformUtils	The iPlatformUtils class bas interface for get access platform dependent functions and constants
CQALogger	Logger handler for app. This class allow to log all message from app to file
CQASecretService	The qasecretservice class This is a simple provider of QASecretService tool See https://github.com/QuasarApp/SecretService
CService	The Service class is a template class for creating a singleton services objects. This is manual control wrapper. You should be manually initializing your service object and manually deinitializing. If you don't destroy your service, then service object will be automatically destroyed when application will be closed
CSettings	This is wrapper of the QSettings object
CSettingsListener	Listener of the ISettings global object. The SettingsListener class is abstract class and contains only one method for hendling settings changes
CValidableObject	Base interface for all object that can be checked to valid