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Take a peek at the ORY stack

https://www.ory.sh/

"Open Source Identity Infrastructure and Services Run User Management, Permission and Role Management, and OAuth 2.0 & OpenID Connect anywhere from your cloud to a Raspberry Pi."

How does it compare to Loginsrv?

Sorry, I know nothing about it; just trying to save others websearch time.

I made one myself for internal gsuite auth https://futurice.com/blog/identity-aware-proxy-for-google-cl...

There is a branch with slack integration in progress ATM

If you package one of the IdentityServer4[1] quickstarts with e.g. Docker you'll get a comparable result.

[1]: https://github.com/IdentityServer/IdentityServer4

This post appears while I was searching just now for similar tools and come across FusionAuth and Keratin Authn. Not yet look into the details.