XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
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.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
footnote - A beautiful, fast, and simple note taking app in the style of elementary
NoteLedge - Multimedia Notepad , Stay Organized and Make Beautiful Notes