| QTS_ActionDrawLabel | This action class can handle user events to draw labels |
| QTS_ApplicationWindow | Main application window |
| QTS_Document | Document class |
| QTS_Graphic | Thin wrapper around RS_Graphic |
| QTS_GraphicView | Graphic widget which visualizes the diagram and redlining and adds additional scale bars and other GUI controls |
| QTS_Label | Class for a line entity |
| QTS_Math | General math functions |
| QTS_Record | Represents a record in the time series table |
| QTS_Table | Represents a table (as in a set of records - not a GUI table) |