If you need to send a *.dwg file to someone who doesn’t have AutoCAD loaded on their system, you can download the bloated, official, DWG TrueView from AutoDesk which weighs in at 109 Megabytes. Or, you could go and get eDrawingsViewer which may not have such a wonderful interface but will get your work done perfectly well. It reads almost any version of *.dwg files and supports paper-space too.

Like drawing gateway, this product too is created by SolidWorks who seem to be targeting the leader’s high-priced software in their quest for a share of the market.
http://www.edrawingsviewer.com/
~6 Megabytes

• 2006.04.20 : ProgeCAD
• 2004.07.17 : A9 Cad
• 2002.11.22 : OttoPDF
• 2006.04.27 : Sketchup - along came a spider
• 2006.04.29 : Drawing Gateway
• 2002.11.22 : Terrain Tools