XML Copy Editor - XML Copy Editor is a fast, free, validating XML 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.
MUIbase - MUIbase is a relational, programmable database with graphical user interface for Windows, Mac...
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.