A web-based tool to view, edit, format, and validate JSON
XML editor
Editor for Fixed Width, Csv and Existing Xml files.
Library to parse and emit YAML, and do it fast
PDFCraft is a free, privacy-focused PDF toolkit
C++ Qt ORM (Object Relational Mapping) and ODM library
Kile is a feature-rich LaTeX editor
XMLJ is a Java XML Editor and validator project.
Another drawing editor for LaTeX with PSTricks & TikZ
Dominate is a Python library for creating and manipulating HTML docs
An easy to edit webpage template / cheatsheet
Minimalistic address book in web browser. No server or plugin needed.
An editor for structured documents
A hex editor Eclipse plugin and multi-platform desktop application
CAM XML Editor for XML+JSON+Hibernate+SQL Open-XDX sponsored by Oracle
Vector drawing program for LaTeX using PSTricks
Music score editor
Carefully crafted Android framework
DocBook Editing and Processing for Eclipse
Small, powerful, full featured WYSIWYG editor
Modifies the tags and attributes of the all XML filles in directory