BRViewer

This is a fast, lightweight, free dwg viewer.
It supports dwg file of AutoCAD from R14 to 2018.
It's free.
Features:
- DWG, DXF file fast viewing(dwg file 100% compatible.)
- Print
- Measure tools(Distance, Angle, Coordinates, Area)
- Annotation tools(Text, Leader...)
- 2D / 3D View
- Zoom
- Auto upgrade
- Snap
- Command bar
- Property grid
- Image file viewing(pgn, bmp, jpg, jpeg, jfif, tiff, gif, jpe, tga, dds, dib)
- Export to PDF