ImageJ

ImageJ is a public domain, Java-based image processing program developed at the National Institutes of Health.
http://rsbweb.nih.gov/ij/index.html

reference
http://www.uhnresearch.ca/facilities/wcif/imagej/
http://a-chien.blogspot.com/search/label/ImageJ
http://blog.lifescienceonline.net/2009/01/imagej
http://ggene.cn/html/protocol/ruanjianjiaocheng/2009/0421/284.html
http://nanpao.pixnet.net/blog/post/18257638
http://www.mun.ca/biology/dinnes/B2250/Lab2/ImageJ.htm
http://tw.myblog.yahoo.com/lordliu/

download files
http://rsbweb.nih.gov/ij/download.html