Wind Chime Length Calculator (2022)

https://leehite.org/Chimes.htm is the best source of information I've found on chime design and length. They go into great length about the lower octaves and how you can hear them (or not).

If I was tuning wind chimes, I would probably use Just intonation, not equal temperament because a wind chime play in different keys.

Exceptional circumstances excepted of course.

Had to look up "Solfeggio Healing Frequencies".

There are plenty of 9-hour long YouTube videos (example [1]) cycling through the frequencies. Apparently to be played while you sleep.

[1] https://youtu.be/iXL_MupS6NQ

Nice, although a metric version would be helpful :D