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.

XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.

CherryTree - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

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

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.

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