Xenomorph Image Processor 0.6 Description:
Xenomorph is OpenSource software running on Unix/X11 systems. It provides a unified concept of polynomial and morphologic image filters. It is built for precision, not for speed, that means it works in floating-point mode internally. It can read PNG, JPG and many other formats, and it writes PNG. A nice feature of this software is it's upgradeability by adding new filters. You can learn here how to do this. The software is built with the Trolltech QT3 widget-set, which means Windows and OSX- versions are possible, but the port would cost money (Trolltech provides his free license for UNIX OpenSource development only) so it's not available right now.