XML Copy Editor - XML Copy Editor is a fast, free, validating XML editor.
ListFix() - Download listFix() for free. A Java application that can fix/repair playlists by searching a media library for lost, missing, & renamed files. Supports absolute & relative references, UTF-8, UNC paths, and URLs.
Oxygen XML Editor - Oxygen XML Editor provides a comprehensive suite of XML authoring and development tools.
FileMaker Pro - FileMaker Pro Advanced includes all the features of FileMaker Pro plus a set of advanced tools so you can rapidly build powerful custom apps.
Liquid Studio - XML Tools Provider: XML Studio - Graphical XML Schema Editor.
sPlaylistMaker - sPlaylistMaker allows you to easily create .m3u and .m3u8 playlists