Editor for Fixed Width, Csv and Existing Xml files.
PDFCraft is a free, privacy-focused PDF toolkit
XML editor
C++ Qt ORM (Object Relational Mapping) and ODM library
XMLJ is a Java XML Editor and validator project.
Another drawing editor for LaTeX with PSTricks & TikZ
Kile is a feature-rich LaTeX editor
An easy to edit webpage template / cheatsheet
An editor for structured documents
A hex editor Eclipse plugin and multi-platform desktop application
Vector drawing program for LaTeX using PSTricks
Music score editor
Emacs editing mode for X12 files
A free universal Braille Transcriber
A quick & dirty XUL / XBL prototyping editor for user interface.
LaTeX, AscciMath and MathML editor developed in Javascript and HTML