I've always found Qt's docs very usable: http://qt-project.org/doc/qt-5.1/qtwidgets/qmainwindow.html http://qt-project.org/doc/qt-5.1/qtwidgets/qmainwindow.html

I've always found Qt's docs very usable: http://qt-project.org/doc/qt-5.1/qtwidgets/qmainwindow.html http://qt-project.org/doc/qt-5.1/qtwidgets/qmainwindow.html Also, although not an API, the diagrams in the SQLite docs are extremely helpful in structuring statements: http://www.sqlite.org/lang_createtable.html http://www.sqlite.org/lang_createtable.html