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As you are asking about AutoCAD and drawings, trying to stay in the same category (by comparing "apples with apples" as they say) you could probably consider one of these alternatives:
and bunch of others, some even Open source (free).
Your choice depends largely on the industry you're activating in and on the requirements of the deliverables you will have to prepare.
Sketchup- http://www.sketchup.com/
Freecad- http://www.freecadweb.org/
3ds- http://www.3ds.com/products-services/draftsight-cad-software/
Librecad- http://librecad.org/cms/home.html
Solidworks- http://www.solidworks.com/
Nanocad- http://nanocad.com/
Brlcad- http://brlcad.org/
for2d plans revit is the best program
for3d models sketchup and rhino are the easiest
Solid works,catia,pro-E ,3D max all these software can be used instead of Autocad
Revit is the best replacement and more advacance level for Autocad.
Benefits of Revit
1.Making Sections easier
2.3D View available
3.Clash Detection in coordination
if you are Mechanical Professional so i suggest you CATIA /Solid Works, these software's are best for Mechanical Drafting and Designing
solid works we can use instead of Auto CAD we can make drawing easily and with relation.
All depends in what sector you are working in and for what you are utilizing it ...
What do you want to do? Create drawings of machinery, houses/architectural, civil engineering site plans, GIS...2D or3D drawings?
Are you an advanced or beginner in CAD drafting. What is your/companies budget for a CAD program?
If you are into Plumbing and HVAC perhaps you will find Microstation easier as long you drawing in2D ...
Industrial Planning and most Government agencies (in the US) using Microstation, Arc Info
the car and aircraft industry - CATIA or SolidWorks
manufacturing - SolidWorks ... Inventor ...
Instate of AutoCAD program we can use FreeCad but the result in AutoCAD will be more professional
Bentley Micro Station or Autodesk Revit
