Porkbun are giving away the choice of a .dev or .app TLD (1yr)
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porkbun.com | SHOW YOUR SKILLS WITH .APP OR .DEV
https://porkbun.com/event/freeappdevdomain?coupon=TESTANDCODE
Coupon is TESTANDCODE
I had already used it before realising it was one or the other, honestly its one of the better TLD's IMO, too bad Cloudflare doesn't support it yet.
Edit: I should have mentioned, you have to make a tentative payment of 1 USD, which is reverted.