Documentation for Users
- The official QCAD Book: 
QCAD - An Introduction to Computer-Aided Design

 - User Reference Manual
Translations: English, German
Automatic translations: Danish, Dutch, French, Spanish, Italian, Portuguese, Polish
Partial translations: Japanese, Russian - Tutorials
 - Installation Instructions
 - Installation instructions for Ubuntu (very verbose)
 - Frequently Asked Questions (FAQ)
 - Changelog
 - Features
 - Supported Platforms
 - List of all Keyboard Shortcuts:
 
QCAD/CAM
Developers
- The QCAD Scripting Interface
An introduction to QCAD scripting. - QCAD Application Framework API Documentation
 - Qt API modules overview 
Most of these modules and classes are fully available to scripts. - Compiling QCAD from Sources
 
Command Line Tools
- QCAD Command Line Tools (dwg2bmp, dwg2svg, dwg2pdf)
 
Community
- QCAD User and Developer Discussion Forum
 - Various tips and tutorials from QCAD users, posted to the forum
 
