Wadoku is a Japanese/German dictionary that allows download of its data under a non-commercial license.
We could create two dictionaries from its data:
- Japanese/German dictionary
- Pitch accent information, which could apply to data from any other dictionary
See https://www.wadoku.de/wiki/display/WAD/Wadoku.de-Daten+Lizenz for license and https://www.wadoku.de for the website. https://www.wadoku.de/wiki/display/WAD/Downloads+und+Links for data.