The Airflow landing page that you linked to lists many integrations but when you click on those only a small subset of them are listed in the integrations section of the docs that is linked to. I guess the docs are in need of some more work.

It's easier to look at the APIs:

https://airflow.apache.org/docs/stable/_api/airflow/operator...

https://airflow.apache.org/docs/stable/_api/airflow/contrib/...