XPaint is an easy-to-use image editor which supports many standard and less standard paint procedures that demanding non-professional users would expect. It includes several advanced features like image processing algorithms, programmable C scripts, simultaneous editing of multiple images, and supports a wide variety of image formats.
XPaint has a new home
I have now created a SourceForge project for XPaint and moved all the old releases there.
Find it at http://sourceforge.net/projects/sf-xpaint/.
(...and if you'd like to contribute, mail me...)