AutoCAD/External links

Clones
CADopia 8 is a software similar to AutoCAD. 

Free clones
This section is to include information about AutoCAD clones that are free software.

FreeCAD is an OpenSource CAD/CAE 

A9CAD has a freeware CAD version. 

ProgeCAD 2009 smart! is freeware for non-commercial use. 

DoubleCAD XT

NANOcad has a free copy 

Dassault Systèmes offers Draftsight for free 

AutoCAD Books

 * AutoCAD 2007 and AutoCAD LT 2007 Bible by Ellen Finkelstein
 * AutoCAD 2007 and AutoCAD LT 2007: No Experience Required by David Frey
 * AutoCAD 2007 For Dummies by David Byrnes and Mark Middlebrook
 * Digital Drawing for Designers: A Visual Guide to AutoCAD 2015 by Douglas R. Seidler
 * Exercise Workbook for Beginning Autocad 2006 by Cheryl Shrock
 * Mastering AutoCAD 2007 and AutoCAD LT 2007 by George Omura
 * Up and Running with AutoCAD 2010 by Elliot Gindis
 * AutoCAD 2019: A Problem Solving Approach by Prof. Sham Tickoo

Free AutoCAD Tutorials
CADTutor - Text and video tutorials. 

MyCADSite - Text and video tutorials.