CDRViewer 3 is described as 'tool for the Mac that allows you easily open and convert CorelDRAW Graphic files, Microsoft Visio Drawings and Stencils' and is an app in the Photos & Graphics category. There are seven alternatives to CDRViewer 3 for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and PortableApps.com. The best alternative is LibreOffice - Draw, which is both free and Open Source. Other great apps like CDRViewer 3 are Dia (Free, Open Source), Wondershare EdrawMax (Paid), SmartDraw (Paid) and CDRViewer (Free).
Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.
Instead of starting with a blank screen, SmartDraw gives you the exact template you need. Then use simple commands to add your information and SmartDraw does the rest. There's no other drawing software like it.
Visio Viewer opens Visio drawings directly on a computer without conversion on external Web Servers. Viewing Visio documents is as simple as drag and dropping of files (with a .vsd, .vsdx, .vdx extension) to the Application window.