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ImageJ 1.x, often shortened to ImageJ1 or IJ1, is a stable version of ImageJ which has been under continuous development since 1997. It has always been, and continues to be, a one-developer project of Wayne Rasband.
ImageJ was originally developed in 1997 as a cross-platform version of [[NIH Image]]. ImageJ grew organically over time as Wayne Rasband continued to add features according to user requests. Now there are many hundreds, probably thousands, of plugins written by members of a diverse community.