You forgot Ada 2022 :) https://learn.adacore.com/courses/whats-new-in-ada-2022/inde...

Adacore technically retired the Community version a few years ago, so the most up-to-date free version would be GNAT from FSF (which is what Alire brings in automatically with `alr toolchains --select`).

Going forward there is only one GNAT, and is under Apache 2 license, also a FOSDEM talk this year.

Just clarifying for other folks.

Ada 2022 has some amazing features too - like user defined literals. You can now create custom string types : )

https://learn.adacore.com/courses/whats-new-in-ada-2022/chap...