1. Keys are always sorted.
2. Shows a warning icon when a key is missing or has no value in 3. one of the properties file.
4. Non-ASCII character conversion to/from Unicode.
5. Multiple properties file formating options (key grouping, line wrapping, etc).
6. Can toggle between flat and hierarchical view of keys.
7. Can rename or delete groups of keys.
8. Wizard for creating new resource bundle.
9. Supports Eclipse "nl" structure for I18N of plugins.