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.

Orgzly - Outliner for notes, tasks and to-dos

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

Notin - Notin – notes in notification app helps users in creating alarms to get reminders about important tasks right on the home screen.

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

Light Notes - Light Notes app features options to help users easily taking notes to remember important details and instructions. You can add new notes by entering the title, description and selecting the tile color according to the priority of the task.