QElectroTech is a mature, open-source desktop CAD application for creating electrical schematics and diagrams. Built on Qt (C++) with a rich graphics view framework, it provides full interactive editing for folios, conductors, terminals, element symbols, title blocks, and terminal strips. The system manages project files via XML, supports auto-numbering of elements and conductors, cross-referencing, bill-of-materials export, and imports EPLAN EDZ archives using bundled LZMA decompression. It is purely a desktop application with no server or data-pipeline components, offering a comprehensive set of features for electrical documentation in industrial and domestic contexts. The architecture follows a monolithic desktop GUI pattern with extensive use of Qt's model/view and graphics view frameworks. Key entry points include the main window (QETMainWindow), diagram editor (QETDiagramEditor), element editor, and terminal strip editor. The codebase demonstrates strong use of the undo/redo command pattern (QUndoCommand), a generic QPropertyUndoCommand, and a custom DXF paint engine. The project has a large number of interdependent modules but maintains reasonable separation through abstract base classes (PropertiesInterface, DiagramEventInterface). The code is professionally written with moderate complexity and a clear focus on functional CAD features rather than framework novelty.