I’ve been using this simple and straightforward viewer for as long as I can remember and it just keeps getting better. It can open and print almost any image file I throw at it - and I’ve thrown quite a few over the years. As if that’s not enough, it has a plugin system to extend it’s capabilities (some of the plugins are not free).

« Must Have »

http://www.irfanview.com/
~900 kilobytes

• 2007.10.04 : Tiny PDF
• 2006.05.12 : Free Archicad Plugins from Arexline
• 2006.04.29 : Drawing Gateway
• 2008.06.21 : Photoshop plugins in the GIMP
• 2007.11.22 : GDL Toolbox only in Hungarian
• 2007.02.16 : Sketchup plugin for AC 10