OutWiker VS XML Copy Editor

My Notes Keeper - Home Of My Notes Keeper - My Notes Keeper is the premier note/outliner application for Windows 9x/2000/XP/NT. It allows you to store all of your notes and information in an easy-to-use outline, where you can quickly find what you need.

Altova XMLSpy - The XMLSpy XML Editor is a powerful tool for editing XML and related technologies. It is the only XML Editor with patented SmartFix validation, enterprise-grade editors, converters, debuggers, and code generators.

C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.

Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.

Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.

Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.