Carrd - Simple, responsive one-page site creator.
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.
Cargo - Cargo Collective is a web publishing platform that creates and offers accessible tools online.
XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
Responsivize - A must-have tool to develop responsive websites
Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.