A semi-complete list of custom device manufacturers

As people frequently ask for manufacturers in this subreddit (and others) here's a list of the custom device manufacturers I know about:

Metal Options:

https://www.steelworxx.de/
http://www.rigidchastity.com/
http://malechastitynow.com/Chastity-Device/
https://www.maturemetal.com/
http://www.chastitytube.com/ (currently offline)
https://www.malechastity-devices.com/
https://www.etsy.com/uk/shop/badassworkroom?ref=simple-shop-header-name&listing_id=706912306
https://www.steelwerksextreme.com/

3D Printed Options:

https://kink3d.com/
https://www.evotionwearables.com/
https://www.chastizeme.com/request
https://www.customchastity.com/
https://www.shapeways.com/shops/josielynn-s-body-jewellery
https://blackoutdevices.com/
https://www.shapeways.com/shops/pedro69

Belts:

https://fancysteel.com/
https://behindbarz.co.uk/
https://shop.neosteel.com/en/index
https://www.tollyboy.com/business/languages/intro.php?lang=english
https://www.carrara-designs.be/products/chastitybelts/index.html

Mass Manufactured Devices:

https://cb-x.com/
https://www.holytrainer.com/male-chastity-device/male-chastity-device.asp
https://lockedinlust.com/shop/
https://cellmatechastity.com/

Note on mass manufactured devices: There are also a great number of mass manufactured devices made in china. You'll find these resold on etsy, amazon, ebay and assorted sex and kink toy stores. Typically you can find these on DHGate, Alibaba and Aliexpress. And if you're willing to wait for the shipping you can pick them up very cheaply. There are a range of options but by-and-large these are based on (ripped off if you're being less generous) one of the manufacturers above. They are usually a good way to try a range of styles for not a huge outlay.

I wrote this list for a different reddit answer but figured it would be useful here. Do add any more you know of that I've missed.

(could be useful if stickied if people find it useful)