Here is a list of all topics with brief descriptions:

[detail level 1234]

2D Centroids Scripts
Command Line Tools Examples
Core Module	This module contains some fundamental core classes and abstract base classes for extensions, e.g. RStorage as an abstract base class for all storage implementations or REntity, the base class for all entity classes in the Entity module
DXF Import / Export Module	Implements import / export for the DXF CAD file format based on dxflib
▼ECMAScript	This module contains classes and libraries implemented in ECMAScript (JavaScript)
Block Tools
▼Drawing Tools
Arc Drawing Tools
Circle Drawing Tools
Dimension Drawing Tools
Ellipse Drawing Tools
Hatch Drawing Tools
Image Drawing Tool
Line Drawing Tools
Point Drawing Tools
Polyline Drawing Tools
Shape Drawing Tools
Spline Drawing Tools
Text Drawing Tool
Editing Tools
File Tools
Help Tools
Layer Tools
Measuring / Information Tools
▼Misc Examples and Scripts
▼Example Scripts
Example Block Scripts
Example Command Line Tool Scripts
Example Draw Scripts
Example IO Scripts
Example Layer Scripts
Example Layer Scripts
Example Math Scripts
Example Modify Scripts
Example Qt Scripts
Misc I/O related tools
Misc block related tools
Misc development tools
Misc drawing tools
Misc selection tools
Tutorial scripts
▼Modification Tools
Draw order Tools
Projection Tools
QCAD Simple API
Selection Tools
Snap Tools
View Tools
Widgets
Window Tools
Zoom Tools
Entity Module	This module contains implementations of all CAD entities that are supported by the QCAD Application Framework
GUI Module	GUI implementation of widgets, graphics views and graphics scenes based on the QWidget class of Qt
Grid Module	Implements an orthogonal grid
Math Module	This module contains fundamental classes that implement basic mathematical concepts such as vectors or matrices as well as basic geometrical classes that represent points, lines, triangles and other basic geometrical shapes
Operations Module	This module contains implementations of the ROperation Interface. Operations offer a convenient API to preview and apply common modifications to a drawing document (adding entities, changing entities, removing entities)
QCAD Executable Module	Compiles into the application executable which executes ECMAScript code
Snap Module	Implements object and grid snaps
Spatialindex Module	This module implements the spatial index interface based on the spatial index library from Navel Ltd
Stemmer Module	This module contains class RStemmer for stemming in various languages, typically used for indexing / searching