Retypar
- Convert photos, drawings etc. into plain text and exports the result as text files, images (.jpg) or html.
- http://sourceforge.net/projects/retypar

Shell Extension Image Converter
- Extends windows explorer enabling image conversions to GIF, JPEG, BMP, PNG, PSD, TIFF, PCD, and more.
- http://free.firmtools.com/shellextension/

mosascii m2
- Application that converts images into an HTML mosaic made out of colored ASCII characters.
- http://elitemrp.net/m2/

XnView
- Free multi-format graphics viewer with batch conversion and image processing capabilities.
- http://www.xnview.com

FastStone Image Viewer
- Offering single and multiple conversion types along with a batch image converter, resizing, and Full Screen image viewer.
- http://www.faststone.org

Easy Graphic Converter
- A utility that can convert image files and make thumbnails with the ability to convert one or multiple images.
- http://www.etrusoft.com/graphic-converter/

GIF2PNG The Exorcist
- Freeware utility for converting GIF images files to PNG format. Drag and drop interface, batch operation, move GIF files to recycle bin. [Windows 95, 98, NT4, NT3.51]
- http://www.nigels.com/exorcist/Exorcist.html