Links
Internet-based editors
http://treeeditor.com/ - this web site
A flexible tree-structure - in PHP, by Tony Marston
Inxight: SmartDiscovery's browser-based taxonomy editor - commercial tool
Drupal - Drupal features a PHP-based taxonomy editor
Editors that run locally
Interstage XWand
Taxonomy editor - for Windows
Taxonomy editor
Tree viewers
tree_structure - PHP class
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