So far I have:
- authentication/authorization: Ory (ory.sh)
- payments and billing: Lago (getlago.com) and now
- CRM: Twenty (twenty.com)
What have you seen thus far and are impressed with?
And they're categorized, so you might focus your requests on certain areas (an extension of the OP) in order to get some ground truth.
(Disclaimer: I am the co-founder of Cerbos)