It's Free. It's fast to operate big drawing.
Functions: Preview, Plot, Zoom, Pan, Full-screen view, Magnifier, Multiple Document Interface.
Supported file format: R14~R2015 DWG, DXF.
About Magnifier function: Magnifier is an innovative tool that not only helps to view drawing details or snap points without performing the traditional zoom in/out, pan or even regen commands on big drawings but also is ease of use and customize. You could do it or quit it by clicking the middle mouse button easily.
Notes: This is the 32bits version, if you require 64bits version, please kindly search "DWG FastView" in this website to download it.