A web-based tool to view, edit, format, and validate JSON
PDFCraft is a free, privacy-focused PDF toolkit
XML editor
Editor for Fixed Width, Csv and Existing Xml files.
Repair invalid JSON documents
XMLJ is a Java XML Editor and validator project.
Another drawing editor for LaTeX with PSTricks & TikZ
Kile is a feature-rich LaTeX editor
Fork of JSONView for Chromium-based browsers
Minimalistic address book in web browser. No server or plugin needed.
An easy to edit webpage template / cheatsheet
XML text markup for ancient documents
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
PHP class for PDF
Music score editor
A robust HTML entity encoder/decoder written in JavaScript
Small, powerful, full featured WYSIWYG editor
A free universal Braille Transcriber