XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
Unimus - Unimus is a Network Automation and Configuration management (NCM) solution designed for fast deployment network-wide and ease of use. Unimus does not require learning any abstraction or templating languages, and does not require any coding skills.
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.
Oxidized - configuration backup software (IOS, JunOS) - silly attempt at rancid
Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.
RANCID - RANCID - Really Awesome New Cisco confIg Differ.