TurboCAD offers several AutoCAD plugins as well as the popular TurboCAD LTE software, that works like AutoCAD LT with more advanced features you want.
Expand File Sharing in AutoCAD
Export AutoCAD 3D Models to 3D PDF
Basic Training in TurboCAD LTE
Learn All Aspects of TurboCAD LTE
Export Inventor® files to 3D PDF
Works like AutoCAD LT
Works like AutoCAD LT and more!