Image Viewer Windows XnView v2.43 – free program which is designed for viewing images, supports more than 400 image formats and allows you even converting some formats.
FastStone Image Viewer – is a program for viewing images. FastStone includes sketch file manager and a database, so it can also be used as an image manager.
IrfanView 4.44 – is a free popular image viewer and editor of graphic files.
Free Paint Software Artweaver 5.1.4 – free software for working with bit-map graphics.
Picasa 3.9 – download photos cataloger. Picasa lets you to watch and edit photos.
Autodesk Design Review 2013 – free software for previewing and printing files created by Autodesk application (2D and 3D).
It is easy to view DWG files without AutoCAD. DWG TrueView Program allows you to quickly view, print and convert files with projects created in any version of AutoCAD. This program is absolutely free and is being constantly updated.