This is a spin off from the SD14 Bulb & telescope adapter thread on the Sigma Cameras (digital & analogue) forum.
The image viewer that I already had long before buying my SD14 is IrfanView, a fast free image viewing package for Windows 9x/ME/NT/2000/XP/2003/Vista.
For those interested in trying it out, here is the IrfanView Web site:
http://www.irfanview.com/index.htm
I have not gone through all the packages listed on the CDRAW site. I'm just familure with IrfanView, Iris, and DeepSkyStacker. I may take a look at some, but it's a long listing with 51 packages, besides, I already have a free package which out performs Sigma's.
Ivan Image Converter. It converts your Sigma Camera Raw files (X3F) to JPEG, TIFF, BMP, etc. (more than 40 image formats), also in batch mode or command line. You can edit Sigma RAW images directly in the program with a range of handy tools (resize, rotate, flip, mirror, crop, filters, watermarks, morphing effects, color enhancements, etc.).