Shameless plug for WorkOS. (I'm the founder. Hope that's still ok on HN!)

We're like Stripe for SSO/SAML auth. Docs here: https://workos.com/docs

Here's our HN launch: https://news.ycombinator.com/item?id=22607402

I'd expect Amazon to be better able to maintain uptime than a self-hosted option at most (but not all) companies.

Amazon can't diversify their providers, though.

Regular Joes like us can use AWS, GCE, on premises, some non-reseller colocation provider, etc., and create failover duplicates, alternative deploy targets, or simply not ever have a complete outage due to the unlikelihood of all of these things failing at once.

They diversify, they just do it at a completely different layer than a cloud consumer.

- https://www.etebase.com/

Fusionauth is pretty cool. I’ve worked with the team a bit on the .net core support.

This post from one of our customers about moving from Cognito to FusionAuth may be of interest: https://fusionauth.io/blog/2020/11/18/reconinfosec-fusionaut...

Disclosure: I'm an employee of FusionAuth, and while there is a forever free community edition, it is free as in beer, not as in speech.

im surprised companies still want to build their own identity system or pay companies (ping, auth0) to host it for them

ory looks like a really good project

Anyone have thoughts on their experience with keycloak?

I haven't used it, but heard it's ... complex to get set up and run. (Again, I work for a competitor.)

Here's a reddit with a bunch of posts you could sift through: https://www.reddit.com/r/KeyCloak/

add AccountsJS, a small nice modular typescript/js lib for building account systems easily

Did not know about that one, I added it to the list!