Personally I think of Authelia and Keratin as really good projects in the don't-build-auth-into-your-apps-ever-again space. If auth isn't already built into your app gateway/mesh/proxy, then these services might be something worth dropping alongside.
A few more projects in this space:
- Keycloak (you won't get fired for picking this)[0]
- CloudFoundry's UAA[1]
- Gluu [2]
- ORY (Hydra + friends)[3]
- Keratin [4]
- OpenUnison [5]
- Dex[6]
- Netlify's GoTrue[7]
All of these solutions are a bit different but here are some of the axes:
- Whether or not they function as an OAuth provider
- Whether they're centered around application-user-login via mechanisms like email/password, application auth, or SSO
- Whether or not they serve as a proxy to another down-the-line OAuth provider (Dex, GoTrue)
- GUI availability
- F/OSS-ness (basically all of them have very permissive licenses)
A few more projects in this space:
- Keycloak (you won't get fired for picking this)[0]
- CloudFoundry's UAA[1]
- Gluu [2]
- ORY (Hydra + friends)[3]
- Keratin [4]
- OpenUnison [5]
- Dex[6]
- Netlify's GoTrue[7]
All of these solutions are a bit different but here are some of the axes:
- Whether or not they function as an OAuth provider
- Whether they're centered around application-user-login via mechanisms like email/password, application auth, or SSO
- Whether or not they serve as a proxy to another down-the-line OAuth provider (Dex, GoTrue)
- GUI availability
- F/OSS-ness (basically all of them have very permissive licenses)
[EDIT] More entries for this list in another comment @ https://news.ycombinator.com/item?id=26411457
[0]: https://www.keycloak.org/
[1]: https://github.com/cloudfoundry/uaa
[2]: https://gluu.org/docs/gluu-server/4.2/
[3]: https://github.com/ory/hydra#what-is-ory-hydra
[4]: https://keratin.github.io/authn-server/
[5]: https://github.com/tremolosecurity/openunison
[6]: https://github.com/dexidp/dex
[7]: https://github.com/netlify/gotrue