* https://en.wikipedia.org/wiki/Granny_Smith
Generally anything that's not-soft.
One of the newest varieties is Cosmic Crisp:
* https://en.wikipedia.org/wiki/Cosmic_Crisp
* https://www.bbc.com/news/world-us-canada-50619281
A whole bunch have come out recently it seems:
* https://newengland.com/today/food/the-best-new-apple-varieti...
* https://www.10best.com/interests/food-culture/types-of-apple...