XPaint is a simple paint program for X, suitable for producing simple graphics. It does offer some advanced features such as image processing functions and gradient fill. XPaint was originally written by David Koblas.
darknocK detects edges in images. It is using Artificial Neural Networks to enchance the results of standard algorithms.
A webbased XML development toolkit to edit, validate and preview XML files. This program gives you a structured view of the XML data. It has support for multiple XML formats: SVG, DocBook, XHTML and more. phpXIedit is written in PHP.